| abstract |
PROBLEM TO BE SOLVED: To provide a stereocomplex polylactic acid having excellent molding processability, high molecular weight, high crystallinity and high melting point, a production method thereof, a composition and a molded product. [MEANS FOR SOLVING PROBLEMS] The present invention comprises (1) a polylactic acid unit A having L-lactic acid units of more than 99 to 100 mol% and a D-lactic acid unit of 90 to 99 mol%, or (2) The polylactic acid unit C is composed of more than 99 to 100 mol% of D-lactic acid units and the polylactic acid unit D of 90 to 99 mol% of L-lactic acid units, and A and B or C and D are in a specific weight ratio. Yes, a stereocomplex poly having a weight average molecular weight of 100,000 to 500,000 and a ratio of melting peak at 205 ° C. or higher to 80% or higher of melting peaks in the temperature rising process in differential scanning calorimetry (DSC) measurement Lactic acid, its production method, composition and molded article. [Selection] Figure 1 |