| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing a polylactic acid block copolymer in which a polylactic acid stereocomplex having high molecular weight, high melting point and high thermal stability is formed. <P>SOLUTION: The method for producing the polylactic acid block copolymer includes the steps of: mixing poly-L-lactic acid with poly-D-lactic acid to obtain a mixture having≤30% rate (Sc) of stereocomplex formation; subjecting the mixture to solid-phase polymerization to obtain the polylactic acid block copolymer having≥100,000 weight-average molecular weight and 75-100% rate (Sc) of stereocomplex formation. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
