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AssigneesHitachi Zosen Corporation, Tohoku Electric Power Co., Inc., National University Corporation Nagoya University, NatureWorks LLC
InventorsHisanori Kishida, Takashi Hasegawa, Nobuyoshi Nomura, Makoto Takahashi, Joseph Schroeder, Manuel Natal
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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.
A method for producing semi-crystalline polylactide from a mixture of racemic lactide and meso-lactide, wherein when the mixture is polymerized 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.
Dependencies are inferred from the claim text.