STEREOCOMPLEX POLYLACTIC ACID AND ITS MANUFACTURING PROCESS

PROBLEM TO BE SOLVED: To provide a stereocomplex polylactic acid which has a large molecular weight, an excellent moldability and a high melting point and is highly crystalline. SOLUTION: The stereocomplex polylactic acid consists of (A) a polylactic acid unit A composed of a 90-99 mol% L-lactic acid unit and a 1-10 mol% D-lactic acid unit other than lactic acid and/or copolymer unit composed of lactic acid and (B) a polylactic acid unit B composed of a 90-99 mol% D-lactic acid unit and a 1-10 mol% L-lactic acid unit and/or a copolymer unit and has an average molecular weight of 100,000-500,000 and a ratio of the melting peak at ≥195°C of ≥80% in the melting peaks appearing in the course of rising temperature in differential scanning colorimetry (DSC). COPYRIGHT: (C)2006,JPO&NCIPI