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. The present invention relates to poly-L-lactic acid (L component) having a weight average molecular weight of 4,000 to 30,000, weight average molecular weight of 4,000 to 30,000 poly-D-lactic acid (D component), and The D component and the L component are melt-mixed at a weight ratio of D component / L component = 40/60 to 3/97 or L component / D component = 40/60 to 3/97, and then solidified. This is a method for producing a polylactic acid block copolymer comprising solid-phase polymerization of. [Selection figure] None |