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Definitive proxy statement relating to merger or acquisition

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Rule 14a-101)

Filed by the Registrant x Filed by a Party other than the Registrant ¨

Check the appropriate box:

Cytec Industries Inc.

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

Common Stock, $0.01 par value

Cytec Industries Inc.

5 Garret Mountain Plaza

Woodland Park, New Jersey 07424

Dear Cytec Stockholder,

We cordially invite you to attend a special meeting of common stockholders of Cytec Industries Inc., a Delaware corporation, to be held at the Grand Summit Hotel, 570 Springfield Ave., Summit, NJ 07901 on November 24, 2015 at 1:00 p.m., local time.

On July 28, 2015, the Company entered into a merger agreement with Solvay SA, a public limited company organized under the laws of Belgium, which we refer to as Solvay, and Tulip Acquisition Inc., a Delaware corporation and a wholly owned subsidiary of Solvay that we refer to as Merger Subsidiary. The merger agreement provides for the acquisition by Solvay of the Company through the merger of Merger Subsidiary with and into the Company, with the Company as the surviving corporation.

If the merger is completed, you will be entitled to receive $75.25 in cash, without interest, less any applicable withholding taxes, for each share of our common stock owned by you (unless you have properly exercised, and not lost, your appraisal rights with respect to such shares), which represents a premium of approximately 28.9% to the closing price of our common stock on July 28, 2015, the last trading day prior to the public announcement of the execution of the merger agreement and a premium of approximately 46.2% to the volume weighted average price of a share of our common stock over the one-year period prior to July 27, 2015.

The Board of Directors has unanimously determined that the merger and the other transactions contemplated by the merger agreement are fair to, and in the best interests of, the Company and the stockholders of the Company and approved and declared advisable the merger agreement and the merger and the other transactions contemplated by the merger agreement. The Board of Directors made its determination after consultation with its legal and financial advisors and consideration of a number of factors.

Approval of the proposal to adopt the merger agreement requires the affirmative vote of holders of a majority of the outstanding shares of our common stock entitled to vote on the proposal. The Board of Directors recommends that you vote FOR approval of the proposal to adopt the merger agreement, FOR approval of the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and FOR approval of the proposal to adjourn the special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

Your vote is very important, regardless of the number of shares of our common stock you own. Because stockholders cannot take any action at the meeting unless a majority of the outstanding shares of common stock is represented, it is important that you attend the meeting in person or are represented by proxy at the meeting. The merger cannot be completed unless the merger agreement is adopted by the affirmative vote of the holders of a majority of the outstanding shares of our common stock entitled to vote thereon. Whether or not you plan to attend the special meeting, please complete, date, sign and return, as promptly as possible, the enclosed proxy card in the accompanying postage-paid reply envelope, or submit your proxy by telephone or the Internet. If you attend the special meeting and vote in person, your vote by ballot will revoke any proxy previously submitted. If your shares of our common stock are held in street name by your bank, brokerage firm or other nominee, your bank, brokerage firm or other nominee will be unable to vote your

shares of our common stock without instructions from you. You should instruct your bank, brokerage firm or other nominee to vote your shares of our common stock in accordance with the procedures provided by your bank, brokerage firm or other nominee. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement.

If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan, shares of our common stock equivalent to the value of the common stock interest credited to your account under the respective plan will be voted automatically by the trustee in accordance with your proxy, if the proxy is received by November 19, 2015. If you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

The accompanying proxy statement provides you with detailed information about the special meeting, the merger agreement, and the merger. A copy of the merger agreement is attached as Annex A to the proxy statement. We encourage you to read the entire proxy statement and its annexes, including the merger agreement, carefully. You may also obtain additional information about the Company from documents we have filed with the Securities and Exchange Commission, which we refer to as the SEC.

If you have any questions or need assistance voting your shares of our common stock, please contact Okapi Partners LLC, our proxy solicitor, by calling toll-free at 1-855-305-0855.

The Board of Directors has unanimously approved and declared advisable the merger agreement and recommends that you vote FOR the adoption of the merger agreement.

Thank you in advance for your cooperation and continued support.

The proxy statement is dated October 23, 2015, and is first being mailed to our common stockholders on or about October 26, 2015.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED THE MERGER, PASSED UPON THE MERITS OR FAIRNESS OF THE MERGER AGREEMENT OR THE TRANSACTIONS CONTEMPLATED THEREBY, INCLUDING THE PROPOSED MERGER, OR PASSED UPON THE ADEQUACY OR ACCURACY OF THE INFORMATION CONTAINED IN THE ACCOMPANYING PROXY STATEMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

Cytec Industries Inc.

5 Garret Mountain Plaza

Woodland Park, New Jersey 07424

NOTICE OF SPECIAL MEETING OF STOCKHOLDERS

To Be Held on November 24, 2015

To Our Stockholders:

Notice is hereby given that a special meeting of the common stockholders of Cytec Industries Inc., a Delaware corporation, will be held at the Grand Summit Hotel, 570 Springfield Ave., Summit, NJ 07901 on November 24, 2015 at 1:00 p.m., local time, for the following purposes:

The merger agreement, the merger and the other transactions contemplated by the merger agreement are described more fully in the attached proxy statement, and we urge you to read it carefully and in its entirety.

The Board of Directors has unanimously determined that the merger and the other transactions contemplated by the merger agreement are fair to, and in the best interests of, the Company and the stockholders of the Company and approved and declared advisable the merger agreement and the merger and the other transactions contemplated by the merger agreement. The Board of Directors made its determination after consultation with its legal and financial advisors and consideration of a number of factors.

Approval of the proposal to adopt the merger agreement requires the affirmative vote of holders of a majority of the outstanding shares of our common stock entitled to vote thereon. The Board of Directors recommends that you vote FOR approval of the proposal to adopt the merger agreement, FOR approval of the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and FOR approval of the proposal to adjourn the special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

Your vote is very important, regardless of the number of shares of our common stock you own. Because stockholders cannot take any action at the meeting unless a majority of the outstanding shares of our common stock is represented, it is important that you attend the meeting in person or are represented by proxy at the meeting. The merger cannot be completed unless the merger agreement is adopted by the affirmative vote of the holders of a majority of the outstanding shares of our common stock entitled to vote thereon. Whether or not you plan to attend the special meeting, please complete, date, sign and return, as promptly as possible, the enclosed proxy card in the accompanying postage-paid reply envelope, or submit your proxy by telephone or the Internet. If you attend the special meeting and vote in person, your vote by ballot will revoke any proxy previously submitted. If your shares of our common stock are held in street name by your bank, brokerage firm or other nominee, your bank, brokerage firm or other nominee will be unable to vote your

shares of our common stock without instructions from you. You should instruct your bank, brokerage firm or other nominee to vote your shares of our common stock in accordance with the procedures provided by your bank, brokerage firm or other nominee. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan, shares of our common stock equivalent to the value of the common stock interest credited to your account under the respective plan will be voted automatically by the trustee in accordance with your proxy, if the proxy is received by November 19, 2015. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement.

If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan, shares of our common stock equivalent to the value of the common stock interest credited to your account under the respective plan will be voted automatically by the trustee in accordance with your proxy, if the proxy is received by November 19, 2015. If you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

The Board of Directors has fixed the close of business on September 28, 2015 as the record date for determination of stockholders entitled to receive notice of, and to vote at, the special meeting and any adjournments or postponements thereof. Only stockholders of record at the close of business on the record date are entitled to receive notice of, and to vote at (in person or by proxy), the special meeting and at any adjournment or postponement thereof. You will be entitled to one vote for each share of our common stock that you owned on the record date. A complete list of our stockholders of record entitled to vote at the special meeting will be available for inspection at our principal executive offices at least ten days prior to the date of the special meeting and continuing through the special meeting for any purpose germane to the meeting. The list will also be available at the meeting for inspection by any stockholder present at the meeting.

Only stockholders of record (including street name stockholders who can show that they beneficially owned our common stock on the record date), their duly appointed proxy holders and our guests may attend the special meeting. To gain admittance, please bring the admission ticket with you to the meeting. If your shares of our common stock are held in street name through a bank, brokerage firm or other nominee, please send a written request for an admission ticket to our Secretary at 5 Garret Mountain Plaza, Woodland Park, New Jersey 07424. Please include the following information with your request: (i) a signed cover letter stating your name and complete mailing address, including daytime and evening telephone numbers; that you are requesting an admission ticket; the number of shares that you own in street name; and the name, address and telephone number of your bank, brokerage firm or other nominee that is the stockholder of record for your shares of our common stock, and (ii) an original signed legal proxy from your bank, brokerage firm or other nominee giving you the right to vote the shares at the special meeting. If you are the representative of a corporate or institutional stockholder, you must present valid photo identification along with proof that you are the representative of such stockholder. Please note that cameras, recording devices and other electronic devices will not be permitted at the special meeting.

WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING, PLEASE COMPLETE, DATE, SIGN AND RETURN, AS PROMPTLY AS POSSIBLE, THE ENCLOSED PROXY CARD IN THE ACCOMPANYING POSTAGE-PAID REPLY ENVELOPE, OR SUBMIT YOUR PROXY BY TELEPHONE OR THE INTERNET. IF YOU WILL ATTEND THE SPECIAL MEETING AND VOTE IN PERSON, YOUR VOTE BY BALLOT WILL REVOKE ANY PROXY PREVIOUSLY SUBMITTED.

By Order of the Board of Directors,

Woodland Park, New Jersey

Dated: October 23, 2015.

TABLE OF CONTENTS

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This proxy statement and a proxy card are first being mailed on or about October 26, 2015 to stockholders who owned shares of our common stock as of the close of business on September 28, 2015.

SUMMARY

The following summary highlights selected information in this proxy statement and may not contain all the information that may be important to you. Accordingly, we encourage you to read carefully this entire proxy statement, its annexes and the documents referred to in this proxy statement. Each item in this summary includes a page reference directing you to a more complete description of that topic. You may obtain the information incorporated by reference in this proxy statement without charge by following the instructions under Where You Can Find More Information beginning on page 106.

Parties to the Merger (Page 25)

Cytec Industries Inc. , a Delaware corporation, which we refer to as the Company in this proxy statement, is a global specialty materials and chemicals company that serves the aerospace, agriculture/agrochemical, automotive, defense, electrical/electronics and mining industries, and operates in four segments: (i) aerospace materials, which principally includes advanced composites, carbon fiber, and structural film adhesives, (ii) industrial materials, which includes structural composite materials (high performance automotive, motorsports, recreation, tooling, and other structural materials markets) and process materials (aerospace, wind energy, and other process materials markets), (iii) in process separation, which includes mining chemicals and phosphines and (iv) additive technologies, which includes polymer additives, specialty additives, and formulated resins. The Company was incorporated as an independent public company in December 1993.

Solvay SA , a public limited company organized under the laws of Belgium, which we refer to as Solvay in this proxy statement, is an international chemical group headquartered in Brussels, Belgium. It serves many markets, including energy and the environment, automotive and aeronautics, and electrical and electronics. Solvay is listed on Euronext in Brussels and Paris. Solvay was founded in 1863.

Tulip Acquisition Inc. , a Delaware corporation, was formed by Solvay for the purpose of entering into the merger agreement and completing the merger and the other transactions contemplated by the merger agreement, which we refer to as Merger Subsidiary in this proxy statement. Merger Subsidiary is a wholly owned subsidiary of Solvay and has not engaged in any business except for activities incidental to its formation and as contemplated by the merger agreement. Upon the completion of the merger, Merger Subsidiary will cease to exist and the Company will continue as the surviving corporation.

The Special Meeting (Page 26)

Date, Time and Place of the Special Meeting; Purpose of the Special Meeting (Page 26)

The special meeting will be held at the Grand Summit Hotel, 570 Springfield Ave., Summit, NJ 07901 on November 24, 2015 at 1:00 p.m., local time.

At the special meeting, holders of our common stock, par value $0.01 per share, which we refer to as our common stock, will be asked to approve the proposal to adopt the merger agreement, to approve the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and to approve the proposal to adjourn the special meeting, if necessary or appropriate, for the purpose of soliciting additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

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Record Date and Quorum (Page 26)

The Board of Directors of the Company, which we refer to as the Board of Directors, has fixed the close of business on September 28, 2015 as the record date for determination of stockholders entitled to receive notice of, and to vote at, the special meeting and any adjournments or postponements thereof. Only holders of record of our common stock as of the close of business on the record date are entitled to receive notice of, and to vote at (in person or by proxy), the special meeting and at any adjournment or postponement thereof. As of the close of business on the record date, there were 71,547,119 shares of our common stock outstanding and entitled to vote at the special meeting, held by 3,839 holders of record. Each holder of our common stock is entitled to cast one vote on each matter properly brought before the special meeting for each share of our common stock that such holder owned as of the record date.

The presence at the special meeting, in person or represented by proxy, of the holders of a majority of the shares of our common stock outstanding on the record date constitutes a quorum for the transaction of business at the special meeting. Shares of our common stock represented at the special meeting but not voted, including shares of our common stock for which proxies have been received but for which stockholders have abstained, will be treated as present at the special meeting for purposes of determining the presence or absence of a quorum for the transaction of all business. If you hold your shares through a bank, brokerage firm or other nominee, and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determine whether a quorum is present at the special meeting. Because stockholders cannot take any action at the meeting unless a majority of the outstanding shares of common stock is represented, it is important that you attend the meeting in person or are represented by proxy at the meeting. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement.

If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan, shares of our common stock equivalent to the value of the common stock interest credited to your account under the respective plan will be voted automatically by the trustee in accordance with your proxy, if the proxy is received by November 19, 2015. If you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

Vote Required (Page 27)

Approval of the proposal to adopt the merger agreement requires the affirmative vote of the holders of a majority of the outstanding shares of our common stock entitled to vote thereon. Abstentions will not be counted as votes cast in favor of the proposal to adopt the merger agreement, but will count for the purpose of determining whether a quorum is present. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents

for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

The proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger, as described under Advisory Vote on Merger-Related Compensation for the Companys Named Executive Officers beginning on page 93, requires the affirmative vote of holders of a majority of the shares of our common stock present, in person or represented by proxy, at the special meeting and entitled to vote on the proposal to approve such merger-related compensation. The Company is providing stockholders with the opportunity to approve, on a non-binding, advisory basis, such merger-related executive compensation in accordance with Section 14A of the Securities Exchange Act of 1934 (as amended), which we refer to as the Exchange Act. Abstentions will have the same effect as a vote AGAINST approval of this proposal. If you fail to submit a proxy or vote in person at the special meeting or if your shares of our common stock are held through a bank, brokerage firm or other nominee and you do not instruct your bank, brokerage firm or other nominee to vote your shares of our common stock, your shares of our common stock will not be voted, but this will not have an effect on the proposal to approve the merger-related executive compensation.

The proposal to adjourn the special meeting, if necessary or appropriate, for the purpose of soliciting additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting requires the affirmative vote of the holders of a majority of the shares of our common stock present, in person or represented by proxy, and entitled to vote on the proposal to approve such adjournment. Abstentions will have the same effect as a vote AGAINST approval of this proposal. If you fail to submit a proxy or to vote in person at the special meeting or if your shares of our common stock are held through a bank, brokerage firm or other nominee and you do not instruct your bank, brokerage firm or other nominee to vote your shares of our common stock, your shares of our common stock will not be voted, but this will not have an effect on the proposal to adjourn the special meeting.

As of September 28, 2015, the record date, the directors and executive officers of the Company beneficially owned and were entitled to vote, in the aggregate, 511,555 shares of our common stock (not including any shares of our common stock deliverable upon exercise or conversion of any options, stock appreciation rights, restricted shares or phantom awards), representing approximately 0.7% of the outstanding shares of our common stock. The directors and officers have informed the Company that they currently intend to vote all such shares of our common stock FOR approval of the proposal to adopt the merger agreement, FOR approval of the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and FOR approval of the proposal to adjourn the special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

Proxies and Revocation (Page 30)

Any stockholder of record entitled to vote at the special meeting may submit a proxy by telephone, over the Internet or by returning the enclosed proxy card in the accompanying postage-paid reply envelope, or may vote in person by appearing at the special meeting. If your shares of our common stock are held in street name through a bank, brokerage firm or other nominee, you should instruct your bank, brokerage firm or other nominee on how to vote your shares of our common stock using the instructions provided by your bank, brokerage firm or other nominee. If you are a beneficial owner and wish to vote in person at the special meeting, you must provide a legal proxy from the bank, brokerage firm or other nominee that is the stockholder of record for your shares of our common stock giving you the right to vote the shares at the meeting. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares

are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement. If you fail to vote in person at the special meeting or fail to return your proxy card or fail to submit your proxy by phone or the Internet, your shares of our common stock will not have an effect on the proposal to approve the merger-related executive compensation or on the proposal to adjourn the special meeting. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

You have the right to revoke a proxy, whether delivered over the Internet, by telephone or by mail, at any time before it is exercised, by filing a notice of revocation with our Secretary by the time the special meeting begins, by filing a duly executed proxy card or voting instruction form bearing a later date, by submitting a later dated proxy or providing new voting instructions over the Internet or by telephone, or by attending the special meeting and voting in person. Written notice of revocation should be mailed to: Cytec Industries Inc., Attention: Secretary, 5 Garret Mountain Plaza, Woodland Park, New Jersey 07424. If you hold shares in street name through a bank, brokerage firm or other nominee, you should contact the bank, brokerage firm or other nominee that holds your shares for instructions on how to change your vote.

The Merger (Page 33)

The merger agreement provides that Merger Subsidiary will merge with and into the Company. The Company will survive the completion of the merger, and will continue to do business as the Company following the consummation of the merger. We refer to the Company in this context as the surviving corporation. As a result of the merger, the Company will cease to be a publicly traded company and will become a wholly owned direct or indirect subsidiary of Solvay. If the merger is completed, you will not own any shares of the capital stock of the surviving corporation.

Merger Consideration (Page 33)

In the merger, each issued and outstanding share of our common stock (other than shares held by a holder who has not voted in favor of the merger or consented thereto in writing and who has demanded appraisal for such shares in accordance with Section 262 of the General Corporation Law of the State of Delaware (which we refer to as the DGCL), which shares we refer to as dissenting shares, and shares of our common stock held by the Company, Solvay or either of their respective subsidiaries, which, together with dissenting shares, we refer to as excluded shares) will be converted into the right to receive the merger consideration in cash in an amount equal to $75.25 per share, without interest and less any applicable withholding taxes.

Reasons for the Merger; Recommendation of the Board of Directors (Page 42)

After careful consideration of various factors described in the section entitled The MergerReasons for the Merger; Recommendation of the Board of Directors beginning on page 42, the Board of Directors, has unanimously determined that the merger and the other transactions contemplated by the merger agreement are fair to, and in the best interests of, the Company and the stockholders of the Company and approved and declared advisable the merger agreement and the merger, the other transactions contemplated by the merger agreement. The Board of Directors also unanimously resolved that the merger agreement be submitted for consideration by the stockholders of the Company at a special meeting of its stockholders and recommended that the stockholders of the Company vote to adopt the merger agreement.

In considering the recommendation of the Board of Directors with respect to the proposal to adopt the merger agreement, you should be aware that our directors and executive officers may have interests in the merger that are different from, or in addition to, yours. The Board of Directors was aware of and considered these interests, among other matters, in evaluating and negotiating the merger agreement and the merger, and in recommending that the merger agreement be adopted by the stockholders of the Company. See the section entitled The MergerInterests of Certain Persons in the Merger beginning on page 58.

The Board of Directors recommends that you vote FOR approval of the proposal to adopt the merger agreement, FOR approval of the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and FOR approval of the proposal to adjourn the special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

Opinion of the Companys Financial Advisor (Page 46)

On July 28, 2015, at the meeting of the Board of Directors at which the proposed merger was approved, J.P. Morgan Securities LLC, which we refer to as J.P. Morgan, rendered to the Board of Directors its oral opinion, confirmed by delivery of a written opinion, dated July 28, 2015, to the effect that, as of such date and based upon and subject to the various factors, assumptions, qualifications and limitations set forth in its written opinion, the merger consideration to be paid to the Companys common stockholders in the proposed merger of $75.25 per share in cash was fair, from a financial point of view, to such stockholders.

The full text of the written opinion of J.P. Morgan dated July 28, 2015, which sets forth, among other things, the assumptions made, matters considered, and qualifications and any limitations on the opinion and the review undertaken by J.P. Morgan in connection with rendering its opinion, is attached as Annex C to this proxy statement and is incorporated herein by reference. The summary of the opinion of J.P. Morgan set forth in this proxy statement is qualified in its entirety by reference to the full text of such opinion, and the Companys stockholders are urged to read the opinion carefully and in its entirety. J.P. Morgans written opinion was addressed to the Board of Directors (in its capacity as such) in connection with and for the purposes of its evaluation of the proposed merger, was directed only to the fairness, from a financial point of view, of the merger consideration to be paid to the Companys common stockholders and did not address any other aspect of the merger. J.P. Morgan has expressed no opinion as to the fairness of any consideration paid in connection with the merger to the holders of any other class of securities, creditors or other constituencies of the Company or as to the underlying decision by the Company to engage in the merger. The issuance of J.P. Morgans opinion was approved by a fairness committee of J.P. Morgan. The opinion does not constitute a recommendation to any stockholder of the Company as to how such stockholder should vote at the special meeting with respect to the proposed merger or any other matter.

For a description of the opinion that the Board of Directors received from J.P. Morgan, see The MergerOpinion of the Companys Financial Advisor beginning on page 46.

Financing of the Merger (Page 56)

Solvays obligation to complete the merger is not conditioned on Solvays receipt of any financing. Solvay expects to fund amounts needed to acquire the Company under the merger agreement through the use of existing cash resources and the proceeds of new indebtedness. Solvay has obtained binding bridge financing commitments (in a definitive credit agreement) for the transactions contemplated by the merger agreement. It plans to refinance and/or replace the bridge financing with a EUR 1.5 billion rights issue, EUR 1 billion of additional hybrid instruments and an issuance of senior debt.

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Interests of Certain Persons in the Merger (Page 58)

In considering the recommendation of the Board of Directors with respect to the proposed merger, you should be aware that executive officers and directors of the Company may have certain interests in the merger that may be different from, or in addition to, the interests of the Companys stockholders generally. The Board of Directors was aware of and considered these interests, among other matters, in evaluating and negotiating the merger agreement and the merger, and in recommending that the merger agreement be adopted by the stockholders of the Company. These interests include, but are not limited to, the following:

For further information with respect to the arrangements between the Company and its directors and executive officers, see the information included under The MergerInterests of Certain Persons in the Merger beginning on page 58 and Advisory Vote on Merger-Related Compensation for the Companys Named Executive OfficersGolden Parachute Compensation beginning on page 93.

Material U.S. Federal Income Tax Consequences of the Merger (Page 61)

The exchange of shares of our common stock for cash pursuant to the merger generally will be a taxable transaction to U.S. holders (as defined in The MergerMaterial U.S. Federal Income Tax Consequences of the Merger on page 63) for U.S. federal income tax purposes. Stockholders who are U.S. holders and who exchange their shares of our common stock in the merger for cash will generally recognize gain or loss in an amount equal to the difference, if any, between the amount of cash received with respect to such shares and their adjusted tax basis in their shares of our common stock. Backup withholding may also apply to the cash payments paid to a non-corporate U.S. holder pursuant to the merger unless the U.S. holder or other payee provides a taxpayer identification number, certifies that such number is correct and otherwise complies with the backup withholding rules. You should read The MergerMaterial U.S. Federal Income Tax Consequences of the Merger beginning on page 63 for a more detailed discussion of the U.S. federal income tax consequences of the merger.

You should also consult your tax advisor for a complete analysis of the effect of the merger on your federal, state and local and/or foreign taxes.

Regulatory Approvals (Page 65)

HSR Act and Competition Law Approvals

To complete the merger, the parties must make filings with and obtain authorizations, approvals or consents from certain antitrust and competition law authorities. The merger cannot be completed until (i) any waiting periods applicable to the consummation of the merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, which we refer to as the HSR Act, have expired or been terminated and (ii) any applicable waiting period has expired or been terminated, or, if applicable, approval obtained, under any similar foreign antitrust or competition law in the following jurisdictions: Brazil, the European Union, Israel, Japan, Mexico, South Korea, Turkey, and Ukraine.

On August 25, 2015, Solvay and the Company filed notification of the proposed merger with the Federal Trade Commission (which we refer to as the FTC) and U.S. Department of Justice (which we refer to as DOJ) under the HSR Act. On September 24, 2015, the waiting period under the HSR Act expired.

The Company made applicable filings in Mexico and Ukraine on September 24, 2015, in South Korea on October 5, 2015, in Israel on October 8, 2015, in Turkey on October 9, 2015 and in the European Union on October 13, 2015. The Company currently expects that applicable filings in Brazil and Japan will be made in due course. The Company received clearance in Mexico on October 22, 2015.

The consummation of the merger is not conditioned on any antitrust or competition law regulatory filings in the United States or in any other jurisdiction, other than those described above.

United States National Security Regulations and Approvals

The merger agreement provides for the parties to file a joint voluntary notice under Section 721 of Title VII of the Defense Production Act of 1950 (50 U.S.C. App. 2170), as added by the Exon-Florio Amendment of 1988 and as amended by the Foreign Investment and National Security Act of 2007, which we refer to as Exon-Florio. Exon-Florio provides for national security reviews and, where appropriate, investigations by the Committee on Foreign Investment in the United States (which we refer to as CFIUS) when a foreign company acquires or seeks to acquire control of a U.S. company. CFIUS conducts an initial 30-day review of transactions of which it is notified. For transactions involving entities controlled by a foreign government (within the meaning of control under the Exon-Florio regulations) and/or certain sensitive assets or that otherwise present particular national security concerns, CFIUS typically conducts an additional investigation that must be completed within 45 days. The Company and Solvay submitted a joint voluntary notice of the planned merger to CFIUS on September 14, 2015 and CFIUS is currently reviewing the proposed transaction.

The merger cannot be completed unless (i) the Company and Solvay receive written notice that any review, investigation or other proceeding under Exon-Florio with respect to the merger has concluded without action or recommendation for suspension or prohibition or (ii) the President of the United States of America has not, within fifteen calendar days of a CFIUS report to him, announced a decision to take any action to block, suspend or otherwise prevent the consummation of the merger or any of the other transactions contemplated by the merger agreement.

In addition, under the National Industrial Security Program Operating Manual (which we refer to as NISPOM), for which the Department of Defense has primary implementing authority, a U.S. company that is subject to foreign ownership, control or influence (which we refer to as FOCI) may not perform classified contracts unless steps are taken to mitigate the FOCI. The Company currently performs certain classified

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contracts, and it is expected that the Department of Defense through the Defense Security Service (which we refer to as DSS) will carefully examine the parties proposed FOCI-mitigation measures concurrently with the CFIUS review of the transaction, although DSS has no statutory deadlines for the completion of its review. DSS is expected to require that, prior to completion of the merger, the parties submit an acceptable FOCI-mitigation plan and agree to interim measures that address any FOCI issues pending execution of a formal FOCI-mitigation agreement with the Department of Defense. The parties noted their proposed FOCI-mitigation plan in their notice to CFIUS, and are working with DSS on a detailed FOCI-mitigation plan. It is a closing condition to the merger that Solvay or Merger Subsidiary receive the written approval of DSS to operate the business of the Company pursuant to a FOCI mitigation arrangement in accordance with the NISPOM.

Finally, the Company is registered with the Directorate of Defense Trade Controls (which we refer to as DDTC) of the U.S. Department of State as a manufacturer and exporter of defense articles as that term is defined under the International Traffic in Arms Regulations (22 C.F.R. Parts 120-130) (which we refer to as ITAR). The ITAR require that a registrant notify DDTC at least 60 days prior to the consummation of any transaction that would result in the sale or transfer to a foreign person of ownership or control of a registrant.

The Company submitted the required written notification to DDTC of the transaction on September 21, 2015. The notice period will expire on November 23, 2015, absent a waiver of that period by DDTC. The merger cannot be completed if DDTC sends written notice to the surviving corporation or to Solvay that DDTC has made the final determination that DDTC will neither approve (i) the registration of the surviving corporation as a manufacturer or exporter of defense articles under ITAR nor (ii) the transfer from the surviving corporation to Solvay of the surviving corporations registration as a manufacturer or exporter of defense articles under ITAR.

Legal Proceedings Relating to the Merger (Page 67)

On September 17, 2015, an alleged stockholder of the Company filed a complaint related to the merger in the Superior Court of New Jersey, Passaic County on behalf of a putative class of the Companys stockholders. The lawsuit, captioned Levy v. Cytec Industries Inc., et al. , names as defendants the Company, the Companys directors, Solvay and Merger Subsidiary.

The Levy complaint generally alleges that the Companys directors breached their fiduciary duties by, among other things, conducting a flawed sales process and approving the merger agreement at an inadequate price, agreeing to a transaction through which the individual defendants will receive certain change of control benefits, and by disseminating a preliminary proxy statement in connection with the merger that is allegedly inaccurate or misleading in various respects. The complaint further alleges that these supposed breaches of duty were aided and abetted by Solvay and Merger Subsidiary. The complaint generally seeks, among other things, compensatory and/or rescissory damages and an award of attorneys fees. On October 13, 2015, the Cytec defendants filed a motion to dismiss this action. The defendants believe that the claims asserted in the litigation have no merit.

On October 6, 2015, the first of two putative class actions related to the merger was filed by an alleged stockholder of the Company in the United States District Court, District of Delaware. The first lawsuit, captioned Lagarde v. Cytec Industries Inc. , names as defendants the Company and the Companys directors, and the second lawsuit, filed on October 21, 2015 and captioned Andersen v. Cytec Industries Inc. et al. , names as defendants the Company, the Companys directors, Solvay and Merger Subsidiary.

The two Delaware complaints generally allege that the Companys directors made, and exercised control over other persons who also made, untrue statements of fact and omitted to state material facts necessary to make the statements made not misleading in the preliminary proxy statement relating to the merger, supposedly in violation of Sections 14(a) and 20(a) of the Securities and Exchange Act of 1934, 15 U.S.C. §§ 78-n(a) & 78t(a).

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The Andersen complaint also includes claims that the Companys directors breached their fiduciary duties by, among other things, agreeing to the merger at an inadequate price and following an insufficient sale process, and by making allegedly inadequate or incomplete disclosures relating to the merger in the preliminary proxy statement, and that the Company, Solvay and Merger Subsidiary aided and abetted those purported breaches of duty. The complaints generally seek, among other things, equitable relief to enjoin Cytec and Solvay from consummating the merger, damages and an award of attorneys fees. The defendants have not yet answered or otherwise responded to the complaints. The defendants believe that the claims asserted in the litigation have no merit.

The Merger Agreement (Page 68)

Treatment of Common Stock and Common Stock-Based Awards (Page 69)

No Solicitation; Other Offers (Page 79 )

During the period from the date of the merger agreement until the earlier of the termination of the merger agreement and the effective time of the merger, the merger agreement provides that we are not permitted to, directly (or indirectly through third parties), solicit, initiate or take any action to knowingly facilitate the submission of any acquisition proposal (as defined in The Merger AgreementNo Solicitation; Other Offers beginning on page 79), or, subject to certain exceptions, (i) enter into or participate in any discussions or negotiations with, furnish any information relating to the Company or any of its subsidiaries or afford access to the business, properties, assets, books or records of the Company or any of its subsidiaries to, otherwise cooperate in any way with, or knowingly assist, participate in, facilitate or encourage any effort by any third party that is seeking to make, or has made, an acquisition proposal, (ii) make an adverse recommendation change (as defined in The Merger AgreementNo Solicitation; Other Offers beginning on page 79) or (iii) enter into an alternative acquisition agreement (as defined in The Merger AgreementNo Solicitation; Other Offers beginning on page 79).

Notwithstanding these restrictions, under certain circumstances, we may, prior to the time the merger agreement is adopted by our stockholders, make available information regarding the Company and its subsidiaries, or engage in discussions or negotiations with a person with respect to certain unsolicited written acquisition proposals. In addition, at any time before the merger agreement is adopted by our stockholders, to the extent that the Board of Directors determines in good faith after consultation with outside legal counsel that failure to take such action would be inconsistent with its fiduciary duties under applicable law, we may terminate the merger agreement to enter into an alternative acquisition agreement with respect to a superior proposal, or make an adverse recommendation change in respect of a superior proposal or an intervening event (in each case, as defined in The Merger AgreementNo Solicitation; Other Offers beginning on page 79), so long as we have first complied with certain terms of the merger agreement, including (i) notifying Solvay four business days prior to taking any such action and Solvay does not make a binding written proposal that obviates the need for such action, subject to additional three business day extensions if the terms of the superior proposal materially change during such period and (ii) if applicable, paying a termination fee to Solvay. See The Merger AgreementNo Solicitation; Other Offers beginning on page 79.

Conditions to the Merger (Page 88)

The respective obligations of the Company, Solvay and Merger Subsidiary to consummate the merger are subject to the satisfaction or waiver of certain customary conditions, including the adoption of the merger agreement by our stockholders, receipt of certain regulatory approvals, the absence of any legal prohibitions, the accuracy of the representations and warranties of the parties and compliance by the parties with their respective obligations under the merger agreement. See The Merger AgreementConditions to the Merger beginning on page 88.

Termination (Page 89 )

We and Solvay may, by mutual written consent, terminate the merger agreement and abandon the merger at any time prior to the effective time of the merger, whether before or after the adoption of the merger agreement by our stockholders.

The merger agreement may also be terminated and the merger abandoned at any time prior to the effective time of the merger as follows:

Termination Fee (Page 90)

In certain circumstances, we may be required to pay Solvay a termination fee if the merger agreement is terminated. The termination fee would be payable in the following circumstances:

In the case of the first and second bullets above, we must pay Solvay the termination fee within one business day after such termination.

In the case of the third bullet above, we must pay Solvay the termination fee immediately before and as a condition to such termination.

In the case of the fourth bullet above, we must pay Solvay the termination fee within five business days after the earlier of entry into a definitive agreement with respect to, recommendation to the Companys stockholders of or consummation of, such acquisition proposal.

The termination fee is a cash amount equal to $140,000,000.

Remedies (Page 91)

If the merger agreement is terminated as a result of a knowing and intentional breach of the merger agreement, the breaching party will be fully liable for any and all liabilities and damages incurred or suffered by the other party as a result. The measure of the Companys damages in the event of a knowing and intentional breach of the merger agreement or in the event of fraud will be determined by reference to the total amount that would have been recoverable by the Companys stockholders if the Companys stockholders were third party beneficiaries of the Agreement (the Company stockholders are not third party beneficiaries of the Agreement).

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However, in the event that the merger agreement is terminated under circumstances in which the termination fee becomes payable and the termination fee is paid by the Company, the termination fee (and any additional interest due on the termination fee amount as a result of the Company failing to promptly pay when due the termination fee) will be Solvays and Merger Subsidiarys sole and exclusive remedy for monetary damages under the merger agreement.

The parties are also entitled to an injunction or injunctions to prevent a breach of the merger agreement, and to enforce specifically the performance of the terms and provisions of the merger agreement.

Market Price of Common Stock (Page 97)

The closing price of our common stock on the New York Stock Exchange, which we refer to as the NYSE, on July 28, 2015, the last trading day prior to the public announcement of the execution of the merger agreement, was $58.39 per share of common stock. If the merger is completed, you will be entitled to receive $75.25 in cash, without interest, less any applicable withholding taxes, for each share of our common stock owned by you (unless you have properly exercised, and not lost, your appraisal rights with respect to such shares), which represents a premium of approximately 28.9% to the closing price of our common stock on July 28, 2015, the last trading day prior to the public announcement of the execution of the merger agreement, and a premium of approximately 46.2% to the volume weighted average price of our common stock over the one-year period prior to July 27, 2015.

On October 22, 2015, the most recent practicable date before this proxy statement was mailed to our stockholders, the closing price for our common stock on the NYSE was $74.40 per share of common stock. You are encouraged to obtain current market quotations for our common stock in connection with voting your shares of our common stock.

Appraisal Rights (Page 100)

If the merger is completed, the Companys stockholders will be entitled to appraisal rights under Section 262 of the DGCL. This means that you are entitled to have the fair value of your shares of our common stock determined by the Delaware Court of Chancery and to receive payment based on that valuation in lieu of the merger consideration if you follow exactly the procedures set forth in Section 262 of the DGCL. The ultimate amount you receive in an appraisal proceeding may be less than, equal to or more than the amount you would have received under the merger agreement.

To exercise your appraisal rights, you must submit a written demand for appraisal to the Company before the vote is taken on the proposal to adopt the merger agreement and you must not vote (either in person or by proxy) in favor of the proposal to adopt the merger agreement. If you fail to follow exactly the procedures set forth in Section 262 of the DGCL, you may lose your appraisal rights. See Appraisal Rights beginning on page 100 and the text of the DGCL appraisal rights statute reproduced in its entirety as Annex B to this proxy statement. If you hold your shares of our common stock through a bank, brokerage firm or other nominee and you wish to exercise your appraisal rights, you should consult with your bank, brokerage firm or other nominee to determine the appropriate procedures for the making of a demand for appraisal by your bank, brokerage firm or other nominee. In view of the complexity of the DGCL, stockholders who may wish to pursue appraisal rights should consult their legal and financial advisors promptly.

Delisting and Deregistration of Common Stock (Page 105)

If the merger is completed, our common stock will be delisted from the NYSE and deregistered under the Exchange Act and we will no longer file periodic reports with the SEC on account of our common stock.

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QUESTIONS AND ANSWERS ABOUT THE SPECIAL MEETING AND THE MERGER

The following questions and answers are intended to address briefly some commonly asked questions regarding the merger, the merger agreement and the special meeting. These questions and answers may not address all questions that may be important to you as a stockholder of the Company. Please refer to the Summary beginning on page 1 and the more detailed information contained elsewhere in this proxy statement, the annexes to this proxy statement and the documents referred to or incorporated by reference in this proxy statement, which you should read carefully and in their entirety. You may obtain the information incorporated by reference in this proxy statement without charge by following the instructions under Where You Can Find More Information beginning on page 106.

Because the affirmative vote required to approve the proposal to adopt the merger agreement is based upon the total number of outstanding shares of our common stock entitled to vote on the proposal, if you fail to submit a proxy or vote in person at the special meeting, or abstain, or you do not provide your bank, brokerage firm or other nominee with instructions, as applicable, this will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

Accordingly, abstentions will have the same effect as a vote AGAINST the proposal to approve the merger-related executive compensation. If you fail to submit a proxy or to vote in person at the special meeting or if your shares of our common stock are held through a bank, brokerage firm or other nominee and you do not instruct your bank, brokerage firm or other nominee to vote your shares of our common stock, your shares of our common stock will not be voted, but this will not have an effect on the proposal to approve the merger-related executive compensation. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

Abstaining will have the same effect as a vote AGAINST approval of the proposal to adjourn the special meeting, if necessary or appropriate, for the purpose of soliciting additional proxies. If you fail to submit a proxy or to vote in person at the special meeting or if your shares of our common stock are held through a bank, brokerage firm or other nominee and you do not instruct your bank, brokerage firm or other nominee to vote your shares of our common stock, your shares of our common stock will not be voted, but this will not have an effect on the proposal to adjourn the special meeting. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

If your shares are held in street name by a bank, brokerage firm or other nominee, you are considered the beneficial owner of those shares, and your bank, brokerage firm or other nominee, or their intermediary, is considered the stockholder of record with respect to those shares. Your bank, brokerage firm or other nominee should send you, as the beneficial owner, a package with instructions and describing the procedure for voting your shares (see also the next Q&A below). You are invited to attend the special meeting; however, you may not vote these shares in person at the meeting unless you obtain a legal proxy from the bank, brokerage firm or other nominee that is the stockholder of record for your shares of our common stock giving you the right to vote the shares at the meeting.

Because stockholders cannot take any action at the meeting unless a majority of the outstanding shares of common stock is represented, it is important that you attend the meeting in person or are represented by proxy at the meeting. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present at the special meeting.

In Person . You may attend the special meeting and cast your vote there. Even if you plan to attend the meeting, it is desirable that you vote in advance of the meeting.

Via Our Internet Voting Site at http://www.proxyvote.com . If you received printed proxy materials, follow the instructions for Internet voting printed on your proxy card.

By Telephone . Call toll-free 1-800-690-6903. You also can vote by telephone by following the instructions provided on the Internet voting site or, if you received printed proxy materials, by following the instructions provided on your proxy card.

In Writing . You can vote by completing, signing, dating and returning the proxy card in the enclosed postage-paid envelope.

The Internet and telephone voting facilities for stockholders of record will close at 11:59 p.m., Eastern Time on November 23, 2015.

Beneficial Owner . If you are a beneficial owner, please refer to the instructions provided by your bank, brokerage firm or other nominee to see which of the above choices are available to you. To attend the meeting in person (regardless of whether you intend to vote your shares in person at the meeting), you must obtain an admission ticket in advance of the meeting by following the instructions under The Special MeetingAttendance beginning on page 27 of this proxy statement. Please note that if you are a beneficial owner and wish to vote in person at the special meeting, you must provide a legal proxy from the bank, brokerage firm or other nominee that is the stockholder of record for your shares of our common stock giving you the right to vote the shares at the meeting.

Company Savings Plans . If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan, please refer to How do I vote my Savings Plan shares below on page 21 for instructions on how to vote your shares of our common stock subject to such savings plan.

If you hold shares in street name through a bank, brokerage firm or other nominee, you should contact the bank, brokerage firm or other nominee that holds your shares for instructions on how to change your vote.

If you own shares that are registered in your own name and return a signed proxy card or grant a proxy via the Internet or by telephone, but do not indicate how you wish your shares to be voted, the shares represented by your properly signed proxy will be voted FOR approval of the proposal to adopt the merger agreement, FOR approval of the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and FOR approval of the proposal to adjourn the special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

For the proposal to approve the merger-related executive compensation, you may vote FOR , AGAINST or ABSTAIN . Abstentions will have the same effect as if you voted AGAINST approval of the proposal, but broker non-votes will not have an effect on the proposal.

For the proposal to adjourn the special meeting, if necessary or appropriate, to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting, you may vote FOR , AGAINST or ABSTAIN . Abstentions will have the same effect as if you voted AGAINST approval of the proposal, but broker non-votes will not have an effect on the proposal.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This proxy statement and the other documents referenced therein contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (which we refer to as the Securities Act), and Section 21E of the Securities Exchange Act of 1934, as amended, with respect to the financial condition, results of operations and business of the Company and certain plans and objectives of the Board of Directors, and are subject to the safe harbor created thereby under the Private Securities Litigation Reform Act of 1995.

All statements other than statements of historical or current facts included in this proxy statement are forward-looking statements. Forward-looking statements often use words such as anticipate, target, expect, estimate, intend, plan, goal, believe, will, may, should, would, could or other words or terms of similar meaning. Such statements are based upon our current beliefs and expectations and are subject to significant risks and uncertainties. Actual results may vary materially from those set forth in the forward-looking statements.

Although the Company believes the expectations contained in its forward-looking statements are reasonable, it can give no assurance that such expectations will prove correct. Such risks and uncertainties include: risks and uncertainties related to the proposed transaction with Solvay and Merger Subsidiary including, but not limited to: the expected timing and likelihood of completion of the pending merger, including the timing, receipt and terms and conditions of any required governmental approvals of the pending merger that could cause the parties to abandon the transaction, the state of the credit markets generally and the availability of financing, the occurrence of any event, change or other circumstances that could give rise to the termination of the merger agreement, the possibility the Companys stockholders may not approve the merger, the risk that the parties may not be able to satisfy the conditions to the proposed merger in a timely manner or at all, risks related to disruption of management time from ongoing business operations due to the proposed merger, the risk that any announcements relating to the proposed merger could have adverse effects on the market price of the Companys common stock, and the risk that the proposed transaction and its announcement could have an adverse effect on the ability of the Company to retain and hire key personnel and maintain relationships with its suppliers and customers, and on its operating results and businesses generally. The Company undertakes no obligation to correct or update any forward-looking statements, whether as a result of new information, future events or otherwise. These forward-looking statements are also qualified by, and should be read together with the Forward-Looking Statements, the Risk Factors and the other statements in the Companys Annual Report on Form 10-K for the year ended December 31, 2014 and subsequent Quarterly Reports on Form 10-Q, in each case as filed with the SEC and available at www.sec.gov, and investors should refer to such risk factors and other statements in evaluating the forward-looking statements contained in this proxy statement (see Where You Can Find More Information beginning on page 106). Unless indicated otherwise, the terms Company, we, us, and our each refer collectively to Cytec Industries Inc. and its subsidiaries.

Any forward-looking statements speak only as of the date of this proxy statement, and the Company does not undertake any obligation to correct or update any forward-looking statements to reflect events or circumstances after the date on which such statements are made or to reflect the occurrence of unanticipated events except as otherwise required by law. New factors may emerge from time to time, and it is not possible for the Company to predict all such factors. Furthermore, it may not be possible for the Company to assess the impact of any such factor on its business (viewed independently or together) or the extent to which any factor, or combination of factors, may cause results to differ materially from those contained in any forward-looking statement. The foregoing factors should not be construed as exhaustive.

You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this proxy statement or, in the case of documents referred to or incorporated by reference, the dates of those documents.

PARTIES TO THE MERGER

The Company

Cytec Industries Inc.

5 Garret Mountain Plaza

Woodland Park, NJ 07424

Telephone: (973) 357-3100

The Company, a Delaware corporation, is a global specialty materials and chemicals company that serves the aerospace, agriculture/agrochemical, automotive, defense, electrical/electronics and mining industries, and operates in four segments: (i) aerospace materials, which principally includes advanced composites, carbon fiber, and structural film adhesives, (ii) industrial materials, which includes structural composite materials (high performance automotive, motorsports, recreation, tooling, and other structural materials markets) and process materials (aerospace, wind energy, and other process materials markets), (iii) in process separation, which includes mining chemicals and phosphines and (iv) additive technologies, which includes polymer additives, specialty additives, and formulated resins. The Company was incorporated as an independent public company in December 1993.

Solvay

Solvay SA

Rue de Ransbeek 310

1120 Brussels, Belgium

Telephone: +32 2 264 19 84

Solvay, a public limited company organized under the laws of Belgium, is an international chemical group headquartered in Brussels, Belgium. It serves many markets, including energy and the environment, automotive and aeronautics, and electrical and electronics. Solvay is listed on Euronext in Brussels and Paris. Solvay was founded in 1863.

Merger Subsidiary

Tulip Acquisition Inc.

Rue de Ransbeek 310

1120 Brussels, Belgium

Telephone: +32 2 264 19 84

Merger Subsidiary, a Delaware corporation, was formed by Solvay for the purpose of entering into the merger agreement and completing the merger and the other transactions contemplated by the merger agreement. Merger Subsidiary is a wholly owned subsidiary of Solvay and has not engaged in any business except for activities incidental to its formation and as contemplated by the merger agreement. Upon the completion of the merger, Merger Subsidiary will cease to exist and the Company will continue as the surviving corporation.

THE SPECIAL MEETING

Date, Time and Place of the Special Meeting

This proxy statement is being furnished to our stockholders as part of the solicitation of proxies by the Board of Directors for use at the special meeting to be held at the Grand Summit Hotel, 570 Springfield Ave., Summit, NJ 07901 on November 24, 2015 at 1:00 p.m., local time.

Purpose of the Special Meeting

At the special meeting, holders of our common stock will be asked to:

The Board of Directors recommends that you vote FOR each of the above proposals.

Our stockholders must approve the proposal to adopt the merger agreement in order for the merger to occur. If our stockholders fail to approve the proposal to adopt the merger agreement, the merger will not occur. A copy of the merger agreement is attached as Annex A to this proxy statement, which we encourage you to read carefully and in its entirety.

Record Date and Quorum

The Board of Directors has fixed the close of business on September 28, 2015 as the record date for determination of stockholders entitled to receive notice of, and to vote at, the special meeting and any adjournments or postponements thereof. Only holders of record of our common stock as of the close of business on the record date are entitled to receive notice of, and to vote at (in person or by proxy), the special meeting and at any adjournment or postponement thereof. As of the close of business on the record date, there were 71,547,119 shares of our common stock outstanding and entitled to vote, held by 3,839 holders of record. Each holder of our common stock is entitled to cast one vote on each matter properly brought before the special meeting for each share of our common stock that such holder owned as of the record date.

The presence at the special meeting, in person or represented by proxy, of the holders of a majority of the shares of our common stock outstanding on the record date constitutes a quorum for the transaction of business at the special meeting. Shares of our common stock represented at the special meeting but not voted, including shares of our common stock for which proxies have been received but for which stockholders have abstained, will be treated as present at the special meeting for purposes of determining the presence or absence of a quorum for the transaction of all business. Because stockholders cannot take any action at the meeting unless a majority of the outstanding shares of common stock is represented, it is important that you attend the meeting in person or are represented by proxy at the meeting. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents

credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

In the event that a quorum is not present at the special meeting, the special meeting may be adjourned or postponed for the purpose of soliciting additional proxies. Pursuant to the Companys by-laws, approval of the proposal to adjourn the special meeting in a situation in which a quorum is not present or represented at the special meeting requires the affirmative vote of the holders of a majority of the outstanding shares of our common stock present, in person or represented by proxy, and entitled to vote at the special meeting, whether or not a quorum is present. Approval of the proposal to adjourn the special meeting, if necessary or appropriate, for the purpose of soliciting additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting requires the affirmative vote of the holders of a majority of the outstanding shares of our common stock present, in person or represented by proxy, and entitled to vote on the matter at the special meeting.

Attendance

Only stockholders of record, their duly appointed proxy holders and our guests may attend the special meeting. To gain admittance, please bring the admission ticket with you to the meeting. If your shares of our common stock are held in street name through a bank, brokerage firm or other nominee, please send a written request for an admission ticket to our Secretary at 5 Garret Mountain Plaza, Woodland Park, New Jersey 07424. Please include the following information with your request: (i) a signed cover letter stating your name and complete mailing address, including daytime and evening telephone numbers; that you are requesting an admission ticket; the number of shares that you own in street name; and the name, address and telephone number of your bank, brokerage firm or other nominee that is the stockholder of record for your shares of our common stock, and (ii) an original signed legal proxy from your bank, brokerage firm or other nominee giving you the right to vote the shares at the special meeting. If you are the representative of a corporate or institutional stockholder, you must present valid photo identification along with proof that you are the representative of such stockholder. Please note that cameras, recording devices and other electronic devices will not be permitted at the special meeting.

Vote Required

Approval of the proposal to adopt the merger agreement requires the affirmative vote of the holders of a majority of the outstanding shares of our common stock entitled to vote on the proposal to adopt the merger agreement. For the proposal to adopt the merger agreement, you may vote FOR , AGAINST or ABSTAIN . Abstentions will not be counted as votes cast in favor of the proposal to adopt the merger agreement, but will count for the purpose of determining whether a quorum is present. Your vote is very important, regardless of the number of shares of our common stock you own. Because stockholders cannot take any action at the meeting unless a majority of the outstanding shares of our common stock is represented, it is important that you attend the meeting in person or are represented by proxy at the meeting. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

If your shares of our common stock are registered directly in your name with our transfer agent, Computershare, you are considered, with respect to those shares of our common stock, the stockholder of record. This proxy statement and proxy card have been sent directly to you by the Company. As the stockholder of record, you have the right to vote, to grant your voting rights directly to the Company or to a third-party or to vote in person at the meeting.

If your shares of our common stock are held in street name through a bank, brokerage firm or other nominee, you are considered the beneficial owner of those shares. In that case, this proxy statement has been forwarded to you by your bank, brokerage firm or other nominee who is considered, with respect to those shares of our common stock, the stockholder of record. As the beneficial owner, you have the right to direct your bank, brokerage firm or other nominee how to vote your shares by following their instructions for voting. Your bank, brokerage firm or other nominee should send you, as the beneficial owner, a package describing the procedure for voting your shares.

Banks, brokerage firms or other nominees who hold shares in street name for customers generally have the authority to vote on routine proposals when they have not received instructions from beneficial owners. However, banks, brokerage firms and other nominees are precluded from exercising their voting discretion with respect to approving non-routine matters, such as the proposal to adopt the merger agreement and, as a result, absent specific instructions from the beneficial owner of such shares of our common stock, banks, brokerage firms or other nominees are not empowered to vote those shares of our common stock on non-routine matters. For the purposes of this proposal, if you attend the special meeting and abstain on this proposal, or if you have given a proxy and have abstained on this proposal, this will have the same effect as if you voted AGAINST approval of the proposal. If you do not instruct your bank, brokerage firm or other nominee to vote your shares of our common stock, your shares of our common stock will not be voted, and as broker non-votes, the effect will be the same as a vote AGAINST approval of the proposal to adopt the merger agreement.

The proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger requires the affirmative vote of the holders of a majority of the shares of our common stock present, in person or represented by proxy, and entitled to vote on the proposal to approve such merger-related compensation. For the proposal to approve the merger-related executive compensation, you may vote FOR , AGAINST or ABSTAIN . For purposes of this proposal, if you attend the special meeting and abstain on this proposal, or if you have given a proxy and abstained on this proposal, this will have the same effect as if you voted AGAINST approval of the proposal. If you fail to submit a proxy or vote in person the special meeting or if your shares of our common stock are held through a bank, brokerage firm or other nominee and you do not instruct your bank, brokerage firm or other nominee to vote your shares of our common stock, your shares of our common stock will not be voted, but this will not have an effect on the proposal to approve the merger-related executive compensation.

The proposal to adjourn the special meeting, if necessary or appropriate, for the purpose of soliciting additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting requires the affirmative vote of the holders of a majority of the outstanding shares of our common stock present, in person or represented by proxy, and entitled to vote on the proposal to approve such adjournment. For the proposal to adjourn the special meeting, if necessary or appropriate, for the purpose of soliciting additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting, you may vote FOR , AGAINST or ABSTAIN . For purposes of this proposal, if you attend the special meeting and abstain on this proposal, or if you have given a proxy and abstained on this proposal, this will have the same effect as if you voted AGAINST approval of the proposal. If you fail to submit a proxy or to vote in person at the special meeting or if your shares of our common stock are held through a bank, brokerage firm or other nominee and you do not instruct your bank, brokerage firm or other nominee to vote your shares of our common stock, your shares of our common stock will not be voted, but this will not have an effect on the proposal to adjourn the special meeting.

If you are a stockholder of record, you may have your shares of our common stock voted on matters presented at the special meeting in any of the following ways:

The Internet and telephone voting facilities for stockholders of record will close at 11:59 p.m., Eastern Time on November 23, 2015.

If you are a beneficial owner, you should receive instructions from your bank, brokerage firm or other nominee that you must follow in order to have your shares of our common stock voted. Those instructions will identify which of the above choices are available to you in order to have your shares voted. Please note that if you are a beneficial owner and wish to vote in person at the special meeting, you must provide a legal proxy from your bank, brokerage firm or other nominee that is the stockholder of record for your shares of our common stock giving you the right to vote the shares at the special meeting.

If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan, you may vote by proxy using any of the methods described above, except that your vote must be received by 11:59 p.m., Eastern Time on November 19, 2015. If your proxy is not received by such time, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present. Please note that while you may attend the special meeting as described above, you will not be able to vote the share equivalents credited to your account in person at the special meeting; the only way for you to vote the share equivalents credited to your account is to vote by proxy before 11:59 p.m., Eastern Time on November 19, 2015.

Please refer to the instructions on your proxy or voting instruction card to determine the deadlines for voting over the Internet or by telephone. If you choose to submit a proxy by mailing a proxy card, your proxy card should be mailed in the accompanying postage-paid reply envelope, and your proxy card must be filed with our Secretary by the time the special meeting begins. Please do NOT send in your stock certificate(s) with your proxy card. After the completion of the merger, a separate letter of transmittal will be mailed to you promptly, and in any event within five business days, that will enable you to receive the merger consideration in exchange for your stock certificate(s). If your shares of our common stock are held in street name through a bank, brokerage firm or other nominee, you should contact your bank, brokerage firm or other nominee for instructions as to how to effect the surrender of your street name shares of our common stock in exchange for the merger consideration.

If you vote by proxy, regardless of the method you choose to vote, the individuals named on the enclosed proxy card, and each of them, with full power of substitution, will vote your shares of our common stock in the way that you indicate. When completing the Internet or telephone processes or the proxy card, you may specify whether your shares of our common stock should be voted for or against or to abstain from voting on all, some or none of the specific items of business to come before the special meeting.

If you properly sign your proxy card but do not mark the boxes showing how your shares of our common stock should be voted on a matter, the shares of our common stock represented by your properly signed proxy

will be voted FOR approval of the proposal to adopt the merger agreement, FOR approval of the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and FOR approval of the proposal to adjourn the special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

If you have any questions or need assistance voting your shares, please contact Okapi Partners LLC, our proxy solicitor, by calling toll-free at 1-855-305-0855.

YOUR VOTE IS VERY IMPORTANT, REGARDLESS OF THE NUMBER OF SHARES OF OUR COMMON STOCK YOU OWN. BECAUSE STOCKHOLDERS CANNOT TAKE ANY ACTION AT THE MEETING UNLESS A MAJORITY OF THE OUTSTANDING SHARES OF COMMON STOCK IS REPRESENTED, IT IS IMPORTANT THAT YOU ATTEND THE MEETING IN PERSON OR ARE REPRESENTED BY PROXY AT THE MEETING. WHETHER OR NOT YOU PLAN TO ATTEND THE SPECIAL MEETING, PLEASE COMPLETE, DATE, SIGN AND RETURN, AS PROMPTLY AS POSSIBLE, THE ENCLOSED PROXY CARD IN THE ACCOMPANYING POSTAGE-PAID REPLY ENVELOPE, OR SUBMIT YOUR PROXY BY TELEPHONE OR THE INTERNET. IF YOU WILL ATTEND THE SPECIAL MEETING AND VOTE IN PERSON, YOUR VOTE BY BALLOT WILL REVOKE ANY PROXY PREVIOUSLY SUBMITTED.

As of September 28, 2015, the record date, the directors and executive officers of the Company beneficially owned and were entitled to vote, in the aggregate, 511,555 shares of our common stock (not including any shares of our common stock deliverable upon exercise or conversion of any options, stock appreciation rights, restricted stock units or company deferred stock rights), representing approximately 0.7% of the outstanding shares of our common stock. The directors and officers have informed the Company that they currently intend to vote all such shares of our common stock FOR approval of the proposal to adopt the merger agreement, FOR approval of the proposal to approve, by non-binding, advisory vote, certain compensation arrangements for the Companys named executive officers in connection with the merger and FOR approval of the proposal to adjourn the special meeting, if necessary or appropriate, to solicit additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting.

Proxies and Revocation

Any stockholder of record entitled to vote at the special meeting may submit a proxy by telephone, over the Internet or by returning the enclosed proxy card in the accompanying postage-paid reply envelope, or may vote in person by appearing at the special meeting. If your shares of our common stock are held in street name through a bank, brokerage firm or other nominee, you should instruct your bank, brokerage firm or other nominee on how to vote your shares of our common stock using the instructions provided by your bank, brokerage firm or other nominee. If you are a beneficial owner and wish to vote in person at the special meeting, you must provide a legal proxy from the bank, brokerage firm or other nominee that is the stockholder of record for your shares of our common stock giving you the right to vote the shares at the meeting. If you fail to return your proxy card, submit your proxy by phone or the Internet or vote in person, or if your shares are held in street name by your bank, brokerage firm or other nominee and you fail to instruct your bank, brokerage firm or other nominee to vote your shares of common stock, your shares of our common stock will not be counted for purposes of determining whether a quorum is present at the special meeting and will have the same effect as a vote AGAINST approval of the proposal to adopt the merger agreement. If you fail to vote in person at the special meeting or fail to return your proxy card or fail to submit your proxy by phone or the Internet, your shares of our common stock will not have an effect on the proposal to approve the merger-related executive compensation or on the proposal to adjourn the special meeting. If you participate in the Companys Employees Savings Plan or Employee Stock Purchase Plan and you fail to return

your proxy, the share equivalents credited to your account will be voted by the trustee in the same proportion that it votes share equivalents for which it receives timely instructions from other participants in the respective plan, and will be counted for purposes of determining whether a quorum is present.

You have the right to revoke a proxy, whether delivered over the Internet, by telephone or by mail, at any time before it is exercised, by filing a notice of revocation to our Secretary, which must be filed with the Secretary by the time the special meeting begins, by filing a duly executed proxy card or voting instruction form bearing a later date, by submitting a later dated proxy or providing new voting instructions over the Internet or by telephone, or by attending the special meeting and voting in person. Written notice of revocation should be mailed to: Cytec Industries Inc., Attention: Secretary, 5 Garret Mountain Plaza, Woodland Park, New Jersey 07424. If you hold shares in street name through a bank, brokerage firm or other nominee, you should contact the bank, brokerage firm or other nominee that holds your shares for instructions on how to change your vote.

Adjournments

Although it is not currently expected, the special meeting may be adjourned or postponed for the purpose of soliciting additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting. Pursuant to the Companys by-laws, approval of the adjournment of the special meeting in a situation in which a quorum is not present or represented at the special meeting requires the affirmative vote of the holders of a majority of the outstanding shares of our common stock present, in person or represented by proxy, and entitled to vote at the special meeting, whether or not a quorum is present. Approval of the proposal to adjourn the special meeting, if necessary or appropriate, for the purpose of soliciting additional proxies if there are insufficient votes at the time of the special meeting to approve the proposal to adopt the merger agreement or if a quorum is not present at the special meeting, requires the affirmative vote of the holders of a majority of the outstanding shares of our common stock present, in person or represented by proxy, and entitled to vote on such proposal at the special meeting. Any adjournment of the special meeting for the purpose of soliciting additional proxies will allow the Companys stockholders who have already sent in their proxies to revoke them at any time prior to their use at the special meeting as adjourned.

Anticipated Date of Completion of the Merger

We are working towards completing the merger as soon as possible. Assuming timely receipt of required regulatory approvals and satisfaction of other closing conditions, including the approval by our stockholders of the proposal to adopt the merger agreement, we anticipate that the merger will be completed in the fourth quarter of 2015. If our stockholders vote to approve the proposal to adopt the merger agreement, the merger will become effective as promptly as practicable following the satisfaction or waiver of a number of conditions to the merger, subject to the terms of the merger agreement. See The Merger AgreementClosing and Effective Time of the Merger beginning on page 69.

Rights of Stockholders Who Seek Appraisal

If the merger is completed, the Companys stockholders will be entitled to appraisal rights under Section 262 of the DGCL in connection with the merger. This means that you are entitled to have the fair value of your shares of our common stock determined by the Delaware Court of Chancery and to receive payment based on that valuation in lieu of the merger consideration if you follow exactly the procedures set forth in Section 262 of the DGCL. The ultimate amount you receive in an appraisal proceeding may be less than, equal to or more than the amount you would have received under the merger agreement.

To exercise your appraisal rights, you must submit a written demand for appraisal to the Company before the vote is taken on the proposal to adopt the merger agreement and you must not vote (either in person or by proxy) in favor of the proposal to adopt the merger agreement. If you fail to follow exactly the procedures set

forth in Section 262 of the DGCL, you may lose your appraisal rights. See Appraisal Rights beginning on page 100 and the text of the DGCL appraisal rights statute reproduced in its entirety as Annex B to this proxy statement. If you hold your shares of our common stock through a bank, brokerage firm or other nominee and you wish to exercise your appraisal rights, you should consult with your bank, brokerage firm or other nominee to determine the appropriate procedures for the making of a demand for appraisal by your bank, brokerage firm or other nominee. In view of the complexity of the DGCL, stockholders who may wish to pursue appraisal rights should consult their legal and financial advisors promptly.

Solicitation of Proxies; Payment of Solicitation Expenses

The Company has engaged Okapi Partners LLC to assist in the solicitation of proxies for the special meeting. The Company estimates that it will pay Okapi Partners LLC a fee of $20,600 and telephone charges. The Company has agreed to reimburse Okapi Partners LLC for certain fees and expenses and will also indemnify Okapi Partners LLC and its members, officers, directors, employees, agents and affiliates against certain claims, costs, damages, liabilities, judgments and expenses. The Company may also reimburse banks, brokers or their agents for their expenses in forwarding proxy materials to beneficial owners of our common stock. Our directors, officers and employees may also solicit proxies by telephone, by facsimile, by mail, on the Internet or in person. They will not be paid any additional amounts for soliciting proxies.

Questions and Additional Information

If you have questions about the merger, need assistance in submitting your proxy or voting your shares of our common stock, or need additional copies of the proxy statement or the enclosed proxy card, please contact Okapi Partners LLC, our proxy solicitor, by calling toll-free at 1-855-305-0855.

THE MERGER

This discussion of the merger is qualified in its entirety by reference to the merger agreement, which is attached to this proxy statement as Annex A . You should read the entire merger agreement carefully and in its entirety as it is the legal document that governs the merger.

The merger agreement provides that Merger Subsidiary will merge with and into the Company. The Company will be the surviving corporation in the merger. As a result of the merger, the Company will cease to be a publicly traded company and will become a wholly owned direct or indirect subsidiary of Solvay. You will not own any shares of the capital stock of the surviving corporation.

Merger Consideration

In the merger, each outstanding share of our common stock (other than excluded shares) will automatically be converted into the right to receive an amount in cash equal to $75.25, without interest and less any applicable withholding taxes.

Background of the Merger

From time to time in the past two years, the Board of Directors and senior management of the Company have reviewed and evaluated the Companys strategic alternatives with the goal of enhancing stockholder value, including the possibilities of maintaining the status quo as an independent public entity, potential strategic transactions or a business combination with a strategic partner, a potential acquisition of the Company by a strategic or a financial sponsor and a levered recapitalization, as well as a wide range of internal growth strategies, including the expansion of existing commercial relationships. The Companys reviews of strategic alternatives have, among other things, led senior management of the Company to have informal discussions with third parties and customers from time to time concerning the possibility of commercial collaborations that could both be profitable for the Company and beneficial in developing new or improved products, or reducing prices, for customers. Except as otherwise described below, none of these discussions in the last two years has progressed beyond the initial stages to a specific proposal for a potential merger with, or acquisition of, the Company.

On several occasions commencing in July 2014, one of the Companys largest customers expressed to the Companys management its support for a potential collaboration between, or combination of, the Company and a third party, Party A. The customer informed the Companys management that the customer believed a collaboration between, or combination of, the Company and Party A would result in a more effective supplier for the customer.

Commencing with a phone call from Mr. S.D. Fleming to a representative of Party A on August 10, 2014, and over the course of the subsequent eleven months, representatives of the Company and Party A discussed on numerous occasions the possibility of a business combination or a strategic collaboration between the Company and Party A. On January 15, 2015, a representative of the Company provided a form of non-disclosure and confidentiality agreement to a representative of Party A, and, after negotiations, Party A executed the non-disclosure and confidentiality agreement (which did not include a standstill covenant) as of January 29, 2015.

From October 2014 through June 2015, Party A made four proposals to acquire the Company. The first proposal was made orally on October 23, 2014 and contemplated an acquisition of the Company by Party A at a price of $50.38 per share payable entirely in Party A common stock. The second proposal was dated March 7, 2015 and contemplated an acquisition of the Company by Party A for $62.00 per share in a combination of cash and Party A common stock. The third proposal, dated April 7, 2015, contemplated an acquisition of the Company by Party A at a price of $66.00 per share payable in a combination of cash and Party A common stock. The fourth proposal was made orally on June 4, 2015 and contemplated an acquisition of the Company by Party A at

a price of $68.00 per share payable in a combination of cash and Party A common stock. The Companys Board of Directors was promptly advised of each of these proposals.

On December 19, 2014, the Board of Directors formed a committee composed of three directors, Messrs. A.G. Fernandes, L.L. Hoynes, Jr., and W.P. Powell, which we refer to as the Transaction Committee, to assist the Board of Directors in efficiently reviewing and supervising, on a more day-to-day basis, the discussions with Party A as well as to review and supervise the Companys consideration of other potential strategic alternatives. The Company retained J.P. Morgan and Sullivan & Cromwell LLP, which we refer to as Sullivan & Cromwell, both of which had worked extensively with the Company in connection with the Companys historical consideration and implementation of strategic alternatives, to assist it in considering the potential transaction with Party A as well as to assist the Transaction Committee and the Board of Directors in evaluating the Companys strategic alternatives more generally. The Company also retained Arnold & Porter LLP, which we refer to as Arnold & Porter, to assist it in considering competition and certain other regulatory issues in connection with the potential transaction with Party A and others.

During the period from October 2014 through July 2015, the Transaction Committee and the Board of Directors met numerous times to receive updates regarding the status of Company managements discussions with Party A and to provide direction, after consultation with Company management and representatives of J.P. Morgan, Sullivan & Cromwell and Arnold & Porter, to Company management regarding the discussions with Party A and responses to the offers made by Party A. Additionally, the Chair of the Transaction Committee frequently updated and collected feedback from the directors not on the Transaction Committee about the activities of the Transaction Committee. Also during this period, representatives of J.P. Morgan discussed with the Board of Directors, among other things, a preliminary valuation of the Company and certain strategic alternatives, including pursuing the Companys strategic plan as a standalone company, a business combination with Party A, conducting a broader sales process or engaging in a levered recapitalization. The Board of Directors and the Transaction Committee decided not to conduct a broader sales process during this period because they had not determined that a sale of the Company would be in the best interests of the Company and its stockholders. In addition, the Companys customer who had expressed support for a potential collaboration between, or combination of, the Company and Party A had not expressed support for a sale of the Company to any third party. The Transaction Committee and the Board of Directors considered advice from Arnold & Porter as to the likelihood of whether a combination with Party A would receive regulatory approval and the possibility that divestitures might be required to obtain regulatory approval and assessed the effect of any possible divestitures on the value of the consideration paid in shares of Company A stock and the time required to obtain regulatory approval. At the direction of the Transaction Committee and the Board of Directors, Mr. Fleming consistently advised a representative of Party A during this period that the Board of Directors considered the per share price offered by Party A to be inadequate, and that the Company was unwilling to consider a combination with Party A unless it was structured so as to provide the Companys shareholders with appropriate certainty of closing, particularly with respect to Party As obligation to undertake divestitures and other remedial actions that might be necessary to obtain regulatory approval in light of certain competitive overlaps between the Company and Party A.

On June 15, 2015, Mr. Fleming communicated to a representative of Party A that Party A would not be given access to management presentations and operational due diligence unless Party A would agree to undertake any remedial actions necessary to obtain regulatory approval as long as the remedial actions (i) would not cause a material adverse effect on the Company or Party A and (ii) did not require the divestiture of a plant site, and that, if the parties proceeded to due diligence on that basis, the Company would expect that Party A would increase its offer price following diligence. On June 16, 2015, a representative of Party A sent Mr. Fleming a letter stating that Party A was unwilling to agree to undertake all of the remedial actions requested by the Company. The Company and Party A then agreed to end further discussions regarding a combination of the two entities and agreed to continue discussions regarding potential collaboration opportunities.

From time to time in the ordinary course of business, representatives of Company management have met with representatives of Solvay management at industry conferences and scheduled meetings to discuss the state of the industry generally, various possibilities for business between the two parties and both commercial and manufacturing collaboration opportunities. In early June 2015, Mr. Emmanuel Butstraen, President of Solvay Novecare, suggested to Mr. Fleming that he meet with the CEO of Solvay, Jean-Pierre Clamadieu to discuss areas of mutual interest. Mr. Fleming then arranged to meet with Mr. Clamadieu while Mr. Fleming was attending the Paris Air Show on June 16, 2015. During that meeting, Mr. Clamadieu stated that Solvay proposed to acquire the Company for $72.00 per share in cash and provided Mr. Fleming with a letter confirming that offer and requesting access to due diligence and committing to work expeditiously. Mr. Fleming informed Mr. Clamadieu that he would discuss Solvays offer with the Board of Directors. Solvays $72.00 per share offer represented a premium of 16.98% over the closing price of Company stock as of June 16, 2015.

On June 17, 2015, at a meeting of the Transaction Committee with representatives of Company management and J.P. Morgan in attendance, Mr. Fleming updated the Transaction Committee regarding Solvays offer. The Transaction Committee considered the price proposed by Solvay to be attractive in light of its previous discussions with Party A and consideration of the potential benefits and risks associated with the strategic alternatives that the Transaction Committee had evaluated with the assistance of J.P. Morgan during the period beginning in October 2014, including pursuing the Companys strategic plan as a standalone company, conducting a broader sales process in a timely manner or engaging in a levered recapitalization, but noted that the Company had not actively solicited indications of interest in acquiring the Company from potential acquirers. The Transaction Committee discussed with representatives of Company management and J.P. Morgan the various options for a sales process, including conducting a single bidder process, a narrow sales process targeting a smaller group of potential bidders or a broader process involving a wide universe of potential bidders. The Transaction Committee considered the facts and circumstances of the Solvay offer, including that the Solvay offer represented a substantial premium to the EBITDA multiple in similar transactions and to the current price of the Companys stock, together with high certainty of closing. The Transaction Committee determined, based on its members and Company managements and J.P. Morgans knowledge and understanding of the industries in which the Company operates as well as specific company information, that there was a limited universe of potential bidders who would be interested in and capable of making an offer for the entire Company, including the aerospace materials, industrial materials and specialty chemicals segments, on a timely basis at a premium to the Solvay offer with high certainty of closing. Accordingly, the Transaction Committee concluded that the likelihood of an offer superior to Solvays in both quantum and certainty of closing emerging as the result of a broader sales process was small and did not outweigh the potential negative consequences of such a process, including the increased risk of a leak that could adversely impact the Companys performance, customer relationships and employee retention or cause Solvay to withdraw its offer. The Transaction Committee also considered that in any transaction with Solvay the Company would have the ability to terminate the merger agreement with Solvay to accept a superior proposal if one emerged. As a result, the Transaction Committee determined not to engage in a broader sales process and discussed with representatives of Company management and J.P. Morgan the select group of various parties that might be interested in acquiring the Company and that would have the financial resources and other characteristics to potentially match Solvays offer and operational resources to act quickly in view of the potential risks to the Company of a protracted sales process. After discussion and consultation with J.P. Morgan, the Transaction Committee determined not to contact any financial sponsors because the Transaction Committee concluded there was a low likelihood that a financial sponsor would be able to make an offer with a significant or competitive premium due to the absence of meaningful synergies in a transaction with a financial sponsor and the historical returns sought by such sponsors. The Transaction Committee instructed Company management and J.P. Morgan to identify and reach out on a confidential basis to representatives of a small group of companies that, in the judgment of Company management after consultation with J.P. Morgan and the Transaction Committee, were most likely to be interested in acquiring the Company and to have the resources and financial wherewithal to do so expeditiously at a price that would be competitive with Solvays $72.00 per share price. The Transaction Committee considered approximately ten companies that might be interested and capable of acquiring the Company. After consideration of the likelihood that potential synergies would result from, and the potential certainty of closing, a transaction with each party, each partys

disclosed interest in potential acquisitions, each partys capacity to integrate an acquisition of the Company in the next several years in light of the other events and states of facts affecting them, the potential dilutive effects on each partys earnings and each partys ability to finance an acquisition of the Company, among other factors, the Transaction Committee determined that most of the approximately ten companies were unlikely to be interested in or capable of pursuing a transaction at a sufficiently high price. In reaching this determination, in addition to the factors described above, the Transaction Committee also concluded, after consultation with Company management and Sullivan & Cromwell, that, in the unlikely event that any of the potential bidders that had not been contacted were interested in acquiring the Company and had the financial and operational wherewithal to do so, any such bidder would have the ability to make a superior proposal, and the Company would have the ability to terminate the merger agreement with Solvay to accept such a superior proposal. The Transaction Committee preliminarily suggested that J.P. Morgan should contact Party B, Party C and Party D, but indicated that management should continue to work with J.P. Morgan to assess whether these companies met the Transaction Committees criteria and whether any other companies should be included in the Companys outreach effort. The Transaction Committee also directed Mr. Fleming to contact Mr. Clamadieu to confirm that Mr. Fleming would discuss Solvays offer with the Board of Directors.

Thereafter, also on June 17, 2015, Mr. Fleming confirmed to Mr. Clamadieu that he would discuss Solvays $72.00 per share offer with the Board of Directors.

Also around this time, following further discussion with the Transaction Committee and Company management, J.P. Morgan contacted representatives of Party B and Party D to gauge their interest in exploring a potential transaction with the Company. A representative of Party B, which had previously requested that the Company contact Party B if the Company explored the possibility of a sale of the Company, informed J.P. Morgan that Party B would not be willing to make a proposal to acquire the Company given that the Company shares were trading close to their all-time high and Party B believed it would not be able to offer a competitive price. Party D previously had expressed interest in acquiring the Company but a representative of Party D indicated to J.P. Morgan that Party D would not be in a position to provide an initial indication of interest and would not commit to perform material due diligence on the Company unless the Company offered assurances to Party D that the process would remain open for three or four months.

The Board of Directors met on June 22, 2015, with representatives of Company management and of J.P. Morgan in attendance. Mr. Fleming provided an update regarding various strategic alternatives, including the status of the Companys discussions with Party A, and reported on his June 16 th meeting with Mr. Clamadieu. Although the Company had achieved excellent results in the four immediately preceding years as it first announced and then completed a major restructuring of the Companys portfolio, and the Company projections showed strong growth into the future, the Board of Directors considered the Solvay offer as an opportune time to consider a sale of the Company for two reasons. First, both the Companys stock and the overall stock market were trading at or close to their all-time high prices. Second, the Company projections were based in part on assumptions regarding the continued successful capture of new markets for the Company and achievement of the projections would require significant capital investments in both advanced composites for serial automotive and aerospace primary structures, the outcome of which would be subject to unpredictable execution risk, and the Board of Directors considered that this combination of circumstances created more than normal uncertainty as to the likelihood of the Company achieving the Company projections. Mr. Fleming also reported on the status of J.P. Morgans contacts with potential alternative bidders. At the direction of Company management after consultation with the Transaction Committee and the Board of Directors, J.P. Morgan had contacted Party B and Party D, but not Party C, because Company management considered, after consultation with J.P. Morgan, the risk of a leak from contacting Party C to be too great because Party C was rumored to have been the source of leaks in certain previous situations involving Party C. Company management considered that leaks have occurred in numerous public company transactions in which the parties were subject to confidentiality and non-disclosure agreements, such that a customary confidentiality agreement could not necessarily be relied upon to prevent leaks. Company management also considered the potential negative consequences of a leak with respect to the Companys interest in a potential transaction the potential negative consequences of a leak with respect to the Companys interest in a potential transaction, including the potential impact on customer relationships and employee

retention and on Solvays existing offer (which existing offer might have been withdrawn as a result of a leak or, depending upon how the market and stockholders of the Company and Solvay responded to the news of Solvays initial offer, might have hindered the Board of Directors efforts to negotiate with Solvay for a higher price per share), combined with the conclusion, after consultation with J.P. Morgan, that Party C was unlikely to be able to move quickly with respect to a potential acquisition of the Company or offer a sufficiently strong likelihood of an offer that would be competitive with Solvays or other potential acquirors that J.P. Morgan had contacted on behalf of the Company, led the Transaction Committee and Company management to determine that the risks of contacting Party C outweighed the potential benefits. The Board of Directors discussed this conclusion with representatives of Company management and determined, in light of the facts and circumstances, that Party C should not be invited to participate in the process. The Board of Directors discussed whether the Company should contact additional potential bidders. After assessing the likelihood of receiving a competitive offer from additional potential bidders and the increased risk of a leak, the Board of Directors concluded that the Company should not contact other potential bidders at that time. At the conclusion of the meeting, the Board of Directors authorized Mr. Fleming to call Mr. Clamadieu to indicate that although the price offered by Solvay was not sufficient to complete a transaction, it was sufficient to permit Solvay to proceed in its evaluation of a potential transaction, including participation in management presentations and due diligence. The Board of Directors also directed J.P. Morgan to contact representatives of Party D to invite Party D to participate in management presentations with a view to attempting to accelerate Party Ds ability to provide the Company with an indication of interest to acquire the Company.

Following the Board of Directors meeting on June 22, 2015, representatives of J.P. Morgan contacted representatives of Party D to invite Party D to participate in management presentations. Party D declined to participate in management presentations or to otherwise move forward in the process given that the Company would not commit that the process would remain open for three to four months.

On June 25, 2015, a representative of the Company provided a form of non-disclosure and confidentiality agreement to representatives of Solvay, and, after negotiations, Solvay executed the non-disclosure and confidentiality agreement on June 26, 2015. On June 30, 2015, representatives of Solvay participated in management presentations delivered by Company management.

The Transaction Committee had previously determined not to contact Party E because the Transaction Committee believed that Party E was focused on another corporate transaction. On June 26, 2015, J.P. Morgan reported to the Company that Party E might be interested in pursuing an acquisition of the Company and might be willing to commit time and resources to explore an acquisition of the Company. J.P. Morgan became aware of Party Es potential interest during the ordinary course of its regular investment banking coverage of Party E. Representatives of Company management directed representatives of J.P. Morgan to contact Party E. Mr. Fleming informed the Chairman of the Transaction Committee who concurred with this direction. Representatives of J.P. Morgan contacted representatives of Party E who expressed interest in exploring a possible acquisition of the Company. The representatives of J.P Morgan explained that Party E might have to move quickly if they were to be successful in this possible opportunity, and stated that the Company could provide Party E with management presentations early the following week if that would assist Party E in quickly developing a firm view on the Company.

On June 29, 2015, a representative of the Company provided a form of non-disclosure and confidentiality agreement to representatives of Party E, and, after negotiations, Party E executed the non-disclosure and confidentiality agreement on July 1, 2015. The non-disclosure and confidentiality agreement contained a customary standstill covenant, which generally prohibited Party E from acquiring the Companys securities or otherwise seeking to acquire control of the Company, and which by its terms would terminate upon the Company entering into a definitive agreement with a third party providing for a change of control of the Company. On July 1, 2015, representatives of Party E participated in management presentations delivered by Company management.

During the management presentations to the respective firms Party E was requested to provide the Company with an indication of interest by July 13, 2015, and Solvay was requested to complete its preliminary due

diligence and confirm its offer price by July 13, 2015. Solvay had indicated its willingness to confirm its offer price more quickly but a later date was requested to allow Party E more time to provide its indication of interest.

Throughout July of 2015, the Transaction Committee and the Board of Directors met numerous times to consider the status of the Companys discussions with Party A, Party D and Party E and to give Company management and J.P. Morgan instructions concerning next steps in the process.

On July 1, 2015, representatives of Solvay advised representatives of J.P. Morgan that Solvay was prepared to send the Company a draft merger agreement. The Company directed a representative of Sullivan & Cromwell to inform Solvays outside counsel, Davis Polk & Wardwell LLP, that prior to Solvay providing the Company with a draft merger agreement, the Company would provide Solvay with a list of key terms that the Company expected would be included in any draft merger agreement, including a go shop provision. A representative of Davis Polk informed a representative of Sullivan & Cromwell that Solvay would not be receptive to any request to include a go shop provision in the merger agreement.

On June 30, 2015 and July 1, 2015, during Solvay and Party Es respective management presentations, Mr. Fleming advised representatives of Solvay and of Party E, respectively, that the Companys second quarter results, scheduled to be announced in mid-July, would likely be below Wall Street analysts estimates, partly due to a weaker than expected quarter for the Companys industrial materials business.

Starting on July 2, 2015, representatives of the Company provided representatives of Solvay and Party E with access to an electronic data room and from July 2, 2015 until July 13, 2015, the Company provided Solvay with access to representatives of Company management for additional specialized diligence sessions and the Company responded to Solvays numerous due diligence requests. Representatives of Company management observed that Solvay and its advisors commenced a substantial due diligence effort promptly while representatives of Party E appeared to devote much less time to, and involved fewer personnel in, reviewing the information in the electronic data room. The Company elected to postpone providing Party E with access to additional specialized diligence sessions until Party E had submitted an indication of interest so that the Company could assess whether Party E was reasonably likely to be willing to move forward with a transaction at a price that would be competitive with Solvays $72.00 per share offer before undertaking the management distraction and heightened risk of leak associated with scheduling additional management sessions for Party E.

On July 8, 2015, representatives of Sullivan & Cromwell sent representatives of Davis Polk a list of key terms that the Company expected would be included in a draft merger agreement between the Company and Solvay. Among the key terms were several seller-favorable terms, including a 60-day go shop provision with a 15-day...


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