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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Format | Patent |
Language | English |
Published |
02.02.2006
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Abstract | 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 |
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AbstractList | 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 |
Author | KIMURA YOSHIHARU FUKUSHIMA KAZUKI MIURA SHIGENOBU SOGO KAZUAKI TO SHIN TOYOHARA KIYOTSUNA |
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Snippet | 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:... |
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SubjectTerms | 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 |
Title | METHOD FOR PRODUCING POLYLACTIC ACID BLOCK COPOLYMER |
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