MODIFIER FOR POLYLACTIC ACID AND POLYLACTIC ACID COMPOSITION CONTAINING THE MODIFIER

摘要

A modifier for polylactic acid which comprises a block polymer (C) which has a glass transition temperature of 0 DEG C or lower and comprises a polymer block (A) satisfying the relationship 7.80= sigma / rho <8.54 (wherein sigma indicates the solubility parameter of the polymer block and rho indicates the density of the polymer block) and a polymer block (B) satisfying the relationship 8.54= sigma / rho <9.20 (wherein sigma and rho have the same meanings as defined above), the blocks (A) and (B) each independently being a polymer block selected from the group consisting of polyester, polyether, and polyhydroxycarboxylic acid blocks.