| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lactic acid-oxalate block copolymer having toughness superior to that of polylactic acid. SOLUTION: (1) The lactic acid-oxalate block copolymer comprises a polylactic acid block and a polyoxalate block each having a number-average molecular weight of 2,000-50,000 respectively. (2) The crystalline lactic acid-oxalate block copolymer according to the copolymer (1) comprises a polylactic acid block and a polyoxalate block each having an average number of blocks of 0.1-9, respectively. COPYRIGHT: (C)2008,JPO&INPIT
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