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:
Nov. 04, 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
Ring-opening polymerization of a cyclic ester is performed by using an alcohol and water positively as initiators or/and molecular weight-adjusting agents to control the initial properties and properties with time of the resultant aliphatic polyester. More specifically, an aliphatic polyester is produced by ring-opening polymerization of a cyclic ester containing water and an alcohol based on a total proton concentration and a ratio between a mol concentration of carboxyl (carboxylic acid)-source compounds including water and a mol concentration of alkoxycarbonyl (ester)-source compounds, as polymerization-controlling indexes.