The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 2009
Filed:
Oct. 14, 2004
Hiroyuki Sato, Fukushima-Ken, JP;
Fumio Akutsu, Fukushima-Ken, JP;
Fuminori Kobayashi, Fukushima-Ken, JP;
Yasushi Okada, Fukushima-Ken, JP;
Hiroyuki Sato, Fukushima-Ken, JP;
Fumio Akutsu, Fukushima-Ken, JP;
Fuminori Kobayashi, Fukushima-Ken, JP;
Yasushi Okada, Fukushima-Ken, JP;
Kureha Corporation, Tokyo, JP;
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.