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Phthalic Anhydride | Stepan Company

Phthalic Anhydride

Phthalic anhydride (P.A.) is the cornerstone of Stepan’s vertically integrated Polymers division. The phthalic anhydride plant is an integral part of the ISO 9001:2015 Stepan Millsdale site, located in Elwood, Illinois. P.A. is manufactured at this site to supply the internal requirements of the STEPANPOL® polyester polyols product line. In addition, Stepan is a major P.A. supplier to the North American merchant market. End Use Markets Polyester resins Plasticizers Alkyd resin and coatings Polyester polyols Pigments and dyes Engineered plastics Flame retardants

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