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:
Mar. 15, 2016
Filed:
Sep. 11, 2012
Hisanori Kishida, Osaka, JP;
Takashi Hasegawa, Osaka, JP;
Nobuyoshi Nomura, Nagoya, JP;
Makoto Takahashi, Nagoya, JP;
Joseph Schroeder, Minnetonka, MN (US);
Manuel Natal, Minnetonka, MN (US);
Hisanori Kishida, Osaka, JP;
Takashi Hasegawa, Osaka, JP;
Nobuyoshi Nomura, Nagoya, JP;
Makoto Takahashi, Nagoya, JP;
Joseph Schroeder, Minnetonka, MN (US);
Manuel Natal, Minnetonka, MN (US);
Hitachi Zosen Corporation, Osaka-shi, JP;
Tohoku Electric Power Co., Inc., Sendai-shi, JP;
National University Corporation Nagoya University, Nagoya-shi, JP;
NatureWorks LLC, Minnetonka, MN (US);
Abstract
This invention provides a method for synthesizing semi-crystalline polylactides (PLA) even from a lactide mixture including meso-LA and rac-LA. According to the invention, when a mixture of racemic lactide and meso-lactide ispolymerized using a catalyst capable of iso-selectively polymerizing L-lactide and D-lactide, an amorphous poly (meso-lactide) block is formed from meso-lactide and a semi-crystalline poly (racemic lactide) block is formed from racemic lactide by separately polymerizing racemic lactide and meso-lactide by taking advantage of a difference in physicochemical properties between racemic lactide and meso-lactide, whereby polylactide which is semi-crystalline as a whole is produced.