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:
Nov. 12, 2013
Filed:
Jan. 29, 2007
Hiroyuki Sato, Fukushima-Ken, JP;
Yoshinori Suzuki, Fukushima-Ken, JP;
Tomohiro Hoshi, Fukushima-Ken, JP;
Fumio Maeda, Fukushima-Ken, JP;
Hiroyuki Sato, Fukushima-Ken, JP;
Yoshinori Suzuki, Fukushima-Ken, JP;
Tomohiro Hoshi, Fukushima-Ken, JP;
Fumio Maeda, Fukushima-Ken, JP;
Kureha Corporation, Tokyo, JP;
Abstract
A process for producing an aliphatic polyester through ring-opening polymerization of a cyclic ester, wherein a partial polymer in a molten state is continuously introduced into a twin-screw stirring device to continuously obtain a partial polymer in a solid pulverized state, the partial polymer is subjected to solid-phase polymerization, and the resultant polymer is melt-kneaded together with a thermal stabilizer to be formed into pellets. As a result, an aliphatic polyester of a high molecular weight and with little discoloration is produced efficiently.