Start-up of New Production Line Begins at Trinseo’s Zhangjiagang, China Plant

Established MAGNUM™ ABS brand now produced in and for the Asia
Pacific market

BERWYN, Pa.–(BUSINESS WIRE)–$TSE—Trinseo
(NYSE: TSE), a global materials company and manufacturer of plastics,
latex binders and synthetic rubber, announced today the successful
start-up of a MAGNUM™ ABS production line at the company’s manufacturing
plant at the Zhangjiagang, China site. Customers in Asia Pacific will
now have their needs met for MAGNUM™ ABS in the auto, appliance,
electronics, lighting and consumer goods markets.

Trinseo’s MAGNUM™ ABS is manufactured by a mass polymerization
technology that delivers greater product stability and advanced
properties. It can reduce costs for injection molding, sheet & profile
extrusion, and self-coloring, while offering long lasting superior
aesthetics in the final product.

“Production of MAGNUM™ ABS in China is an important milestone for
Trinseo and the Asia Pacific market,” said Tim Stedman, SVP and Business
President, Basic Plastics & Feedstocks at Trinseo. “We are delivering on
our promise at Trinseo of providing our customers with a differentiated
ABS product compared to other competitive resins produced in China
today.”

On November 21st, 2017 an official unveiling ceremony will
take place at the Zhangjiagang site with local dignitaries, neighbor
companies, business management and employees.

This investment further reinforces Trinseo’s commitment to serve
customers in Asia Pacific by producing the established MAGNUM™ ABS
brand. Trinseo will begin selling ABS from this plant in the fourth
quarter of 2017.

About Trinseo

Trinseo (NYSE:TSE) is a global materials solutions provider and
manufacturer of plastics, latex binders, and synthetic rubber. We are
focused on delivering innovative and sustainable solutions to help our
customers create products that touch lives every day — products that are
intrinsic to how we live our lives — across a wide range of end-markets,
including automotive, consumer electronics, appliances, medical devices,
lighting, electrical, carpet, paper and board, building and
construction, and tires. Trinseo had approximately $3.7 billion in net
sales in 2016, with 16 manufacturing sites around the world, and nearly
2,200 employees. For more information visit www.trinseo.com.

Note on Forward-Looking Statements

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“estimate,” “project,” “budget,” “forecast,” “anticipate,” “intend,”
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“potential,” “continue,” and similar expressions are intended to
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to differ materially from results expressed or implied by this press
release. As a result of the foregoing considerations, you are cautioned
not to place undue reliance on these forward-looking statements, which
speak only as of the date of this press release. The Company undertakes
no obligation to publicly update or revise any forward-looking
statements, whether as a result of new information, future events or
otherwise.

Contacts

For editorial information:
Trinseo LLC
Donna St.
Germain, +1-610-240-3307
[email protected]
or
For
editorial information:
Makovsky
Doug Hesney, +1-212-
508-9661
[email protected]