Fina Technology, Inc.

Frank Li

Jerome Thierry-Mieg

Dang Le

Doug Burmaster

A process for the preparation of a molded article formed of an isotactic ethylene propylene copolymer comprising providing an isotactic ethylene-propylene copolymer having an ethylene content of no more than 5 weight percent produced by the copolymerization of ethylene and propylene in the presence of an isospecific metallocene catalyst; heating the copolymer to a molten state; incorporating a nucleating agent into copolymer in an amount effective to provide a uniform shrinkage of the molded article at 48 hours molding of the at least 85% as determined by the differential in transverse and longitudinal shrinkage at the 48 hour mark; extruding the molten copolymer into a mold cavity; cooling the copolymer within the confines of the mold cavity to solidify the copolymer and form the molded article which is then retrieved from the mold cavity.

Injection molding process

A polymeric composition comprising a polymer and a nucleation agent, and having isotropic shrinkage of less than about 20% and a differential shrinkage of less than about 20%.

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Houston, TX, United States of America

Frank Li