Exhibit 4.9

AMENDMENT TO THE

INTERNATIONAL SPECIALTY PRODUCTS INC. 401(K) PLAN

WHEREAS, International Specialty Products Inc. (the “Corporation”) maintains the International Specialty Products Inc.
401(k) Plan (the “Plan”) for the benefit of eligible employees; and

WHEREAS, pursuant to Article X of the Plan, the Corporation, as sponsor of the Plan, has retained the authority to amend the Plan at any time in whole or in part; and

WHEREAS, the Supreme Court of the United States invalidated section 3 of the Defense of Marriage Act for federal tax law purposes; consequently, the Internal Revenue Service issued Revenue Ruling 2013-17 and Notice 2014-19 detailing the rules for identifying same-sex spouses in a qualified retirement plan (collectively, the “Guidance”); and

WHEREAS, the Corporation desires to amend the Plan to conform to the Guidance; and

NOW, THEREFORE, BE IT RESOLVED, that the Plan is amended retroactively to be effective as of June 26, 2013 as follows:

“Spouse” shall mean the spouse of a Participant determined by Federal law applicable to Code §401(a) as announced in Revenue Ruling 2013-17 and Notice 2014-19; provided that to the extent required by a qualified domestic relations order pursuant to the terms of this Plan, a former Spouse of the Participant shall be treated as the Spouse of the Participant.

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IN WITNESS WHEREOF, the Corporation has caused this amendment to the Plan to be executed this 26 day of Sept., 2014