US Patent 7538178 Process for producing aliphatic polyester

Patent 7538178 was granted and assigned to Kureha on May, 2009 by the United States Patent and Trademark Office.

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Patent Inventor Names

Fuminori Kobayashi0

Fumio Akutsu0

Hiroyuki Sato0

Yasushi Okada0

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Patent abstract

An aliphatic polyester improved provided by using water positively as an initiator or/and a molecular weight-adjusting agent, is improved in moisture resistance. More specifically, a cyclic ester containing proton-source compounds including more than 80 ppm of water as an initiator or/and a molecular weight-adjusting agent, is subjected to ring-opening polymerization, and the resultant aliphatic polyester is compounded with a carboxyl group-capping agent to produce such an aliphatic polyester.

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