POLYLACTIC ACID BLOCK COPOLYMER, ITS PREPARATION PROCESS, MOLDED ARTICLE AND POLYLACTIC ACID COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a polylactic acid block copolymer which forms a polylactic acid stereo complex having a high melting point, its preparation process, a molded article therefrom and a polylactic acid block copolymer composition. SOLUTION: This polylactic acid block copolymer comprises a segment consisting of an L-actic acid unit and a segment consisting of a D-lactic acid unit and has a melting point of not less than 200°C. The block copolymer has the segment lengths satisfying Y