POWER OF ATTORNEY

The undersigned hereby constitutes and appoints Loretta
DiLucido, Patricia Halberstadt and Craig Marcus, with full
power of substitution, as the undersigned's true and lawful
attorney-in-fact to:

   1) prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the U.S.  Securities
and Exchange Commission (the "SEC") a Form  ID,  including
amendments thereto, and any other documents necessary or
appropriate to obtain codes and passwords enabling  the
undersigned to make electronic filings with the SEC of
reports required by Section 16(a) of the Securities
Exchange Act of 1934 or any rule or regulation of the SEC;

   2) execute for and on behalf of the undersigned, in the
undersigned's capacity as officer and/or director of
Trinseo S.A.  (the "Company"), Forms 3, 4, and 5 in
accordance  with Section 16(a) of the Securities Exchange
Act of 1934 and the rules thereunder;

   3) do and perform any and all acts for and on behalf of
the undersigned that may be necessary or desirable to
complete and execute any such Form 3, 4, or 5, complete and
execute any amendment or amendments thereto, and timely
file such form with the SEC and any stock exchange or
similar authority; and

   4) take any other action of any type whatsoever in
connection with the foregoing that, in the opinion  of such
attorney-in-fact, may be of benefit to, in the best
interest of, or legally required by, the  undersigned, it
being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to
this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to such attorney-in-fact full
power and authority to do and perform any and every act and
thing whatsoever requisite, necessary, or proper to be done
in the exercise of any of the rights and powers herein
granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with
full power of substitution or revocation, hereby ratifying
and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this power of
attorney and the rights and powers herein granted. The
undersigned acknowledges that the foregoing attorneys-in-
fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming,
any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and
effect until the undersigned is no longer required to file
Forms 3, 4, and 5 with respect to the undersigned's
holdings of and transactions in securities issued by the
Company, unless earlier revoked by the undersigned in a
signed writing delivered to the foregoing attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of December 16, 2019.

/s/ Angelo N. Chaclas
_________________________________________
Name: Angelo N. Chaclas
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