Styron Materials Ireland S-4 Registration of securities issued in business combination transactions

Exhibit 21.1

Subsidiaries of Trinseo Materials Operating S.C.A

Name	Jurisdiction
Styron Materials Ireland	Ireland
Styron US Holding, Inc.	Delaware
Styron LLC	Delaware
Americas Styrenics LLC	Delaware
Styron Finance Luxembourg S.à r.l.	Luxembourg
Styron Finance Luxembourg S.à r.l. Luxembourg, Zweigniederlassung Horgen	Switzerland
Styron Holding B.V.	Netherlands
Styron Holdings Asia Pte. Ltd.	Singapore
Styron (Hong Kong) Limited	Hong Kong
Styron Australia Pty Ltd	Australia
Styron Holdings Asia Pte. Ltd., New Zealand Branch	New Zealand
Taiwan Styron Limited	Taiwan
Styron Korea Ltd.	Korea
Styron Japan Y.K.	Japan
Trinseo Materials Finance, Inc.	Delaware
Trinseo U.S. Receivables Company SPV LLC	Delaware

Styron S/B Latex Zhangjiagang Company Limited	China
SAL Petrochemical (Zhangjiagang) Company Limited	China
Styron Singapore Pte. Ltd.	Singapore
PT. Styron Indonesia	Indonesia
Styron India Trading Private Limited	India
Styron Netherlands B.V.	Netherlands
Styron Deutschland GmbH	Germany
Styron Deutschland Anlagengesellschaft mbH	Germany
Styron Suomi Oy	Finland
Styron Sverige AB	Sweden
Styron France S.A.S.	France
Styron Hellas M. EPE	Greece
Styron Spain S.L.	Spain
Styron Portugal, Lda	Portugal
Styron Europe GmbH	Switzerland
Styron UK Limited	UK
Styron Export GmbH	Switzerland
Styron Kimya Ticaret Limited Sirketi	Turkey
Styron Canada ULC	Canada – Nova Scotia
Styron Italia s.r.l.	Italy
Styron Belgium B.V.B.A.	Belgium
Styron Argentina S. R. L.	Argentina
Styron Chile Comercial Limitada	Chile
Styron do Brasil Comércio de Produtos Químicos Ltda.	Brazil
Styron Services de México, S. de R.L. de C.V.	Mexico
Styron de Colombia Ltda.	Colombia
Styron de México, S. de R.L. de C.V.	Mexico
Sumika Styron Polycarbonate Limited	Japan

Subsidiaries of Trinseo Materials Finance Inc.

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