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:
Jun. 16, 2015
Filed:
Jun. 16, 2011
Hisanori Kishida, Osaka, JP;
Takashi Hasegawa, Osaka, JP;
Kenji Miyaguchi, Sendai, JP;
Takehiko Moriya, Sendai, JP;
Nobuyoshi Nomura, Nagoya, JP;
Ryohei Ogawa, Nagoya, JP;
Hisanori Kishida, Osaka, JP;
Takashi Hasegawa, Osaka, JP;
Kenji Miyaguchi, Sendai, JP;
Takehiko Moriya, Sendai, JP;
Nobuyoshi Nomura, Nagoya, JP;
Ryohei Ogawa, Nagoya, JP;
HITACHI ZOSEN CORPORATION, Osaka-shi, JP;
TOHOKU ELECTRIC POWER CO., INC., Sendai-shi, JP;
NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, Nagoya-shi, JP;
Abstract
To provide a method capable of producing stereocomplex polylactic acid, the method being capable of using carbon neutral materials that are not competitive from foods, such as saccharides, without the use of a method for designing optical resolution, which requires complicated operations and high cost and is difficult to perform mass production. The production method of the present invention comprises: a step of reacting glycerin with sodium hydroxide in high-temperature and high-pressure water to produce a racemic sodium lactate aqueous solution; a step of separating sodium from the racemic sodium lactate aqueous solution to recover racemic lactic acid; a step of dimerizing the racemic lactic acid to produce a lactide mixture containing meso lactide and racemic lactide; a step of separating meso lactide from the mixture to recover racemic lactide; and a step of polymerizing the racemic lactide with a salen-metal complex as a catalyst to produce stereocomplex polylactic acid.