METHOD FOR PRODUCING POLYLACTIC ACID BLOCK COPOLYMER

PROBLEM TO BE SOLVED: To provide a method for producing a polylactic acid block copolymer having a high molecular weight and a high melting point. SOLUTION: The method for producing the polylactic acid block copolymer comprises melt-mixing a poly-L-lactic acid having a weight average molecular weigh...

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Bibliographic Details
Main Authors SOGO KAZUAKI, MIURA SHIGENOBU, TOYOHARA KIYOTSUNA, TO SHIN, KIMURA YOSHIHARU, FUKUSHIMA KAZUKI
Format Patent
LanguageEnglish
Published 02.02.2006
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:PROBLEM TO BE SOLVED: To provide a method for producing a polylactic acid block copolymer having a high molecular weight and a high melting point. SOLUTION: The method for producing the polylactic acid block copolymer comprises melt-mixing a poly-L-lactic acid having a weight average molecular weight of 4,000-30,000 (L-component) and a poly-D-lactic acid having a weight average molecular weight of 4,000-30,000 (D-component) at a weight ratio of D-component/L-component of 40/60-3/97 or L-component/D-component of 40/60-3/97, solidifying the resulting mixture, and subjecting the solidified mixture to solid phase polymerization. COPYRIGHT: (C)2006,JPO&NCIPI
Bibliography:Application Number: JP20040209034