| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow-molded article of polylactic acid excellent in heat-resistance and the like.SOLUTION: A blow molded article comprises a polylactic acid resin (component A) having amino bonds obtained by reacting at least a polylactic acid unit having L-lactic acid as a main component and a polylactic acid unit having D-lactic acid as a main component, with polyisocyanate; each of the polylactic acid units is obtained by either one of the methods of (a) or (b) indicated below; and a ratio of carboxyl groups in terminal functional groups exceeds 50%. The method (a) comprises direct polycondensation of lactic acid as a raw material, and dicarboxylic acid or an acid anhydride by adding them in either of an early stage, during or a later stage of the polymerization process; and the method (b) comprises ring-opening polymerization of an L-lactide or a D-lactide, which is a cyclic dimer of lactic acid, by using an initiator, followed by addition of an acid anhydride. |
