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:
Feb. 02, 1999
Filed:
Jul. 02, 1997
Hiroshi Maeda, Osaka, JP;
Kunihiko Shimizu, Osaka, JP;
Yutaka Miyakawa, Osaka, JP;
Eiichi Kawada, Tokyo, JP;
Koji Yamamoto, Kobe, JP;
Hitomi Ohara, Kyoto-fu, JP;
Seiji Sawa, Kyoto-fu, JP;
Yasuhiro Fujii, Kyoto-fu, JP;
Masahiro Ito, Kyoto-fu, JP;
Kabushiki Kaisha Kobe Seiko Sho, Kobe, JP;
Shimadzu Corporation, Kyoto-fu, JP;
Abstract
A method and system for producing poly(lactic acid) enable trapping and recovering of lactide vapor discharged from a reaction vessel without requiring a solvent or the like. In the method and system, lactide vapor is discharged from a polymerization reaction vessel in which poly(lactic acid) is produced by ring-opening polymerization, and trapped by solidification. The solidified lactide is liquefied by heat. Lactide can be recovered more easily and assuredly.