| 摘要 |
PROBLEM TO BE SOLVED: To provide a polylactic acid-based resin composition capable of manufacturing a polylactic acid-based film or sheet having high biomass degree, excellent transparency and elasticity as well as good appearance, extremely excellent tear strength in use not requiring heat resistance property, and heat resistance property without any melting or deformation even at temperatures of 120°C or higher and enough tear strength in use requiring the heat resistance property.SOLUTION: A polylactic acid-based resin composition comprises (A) a polylactic acid and at least one group selected from (B) an amorphous polyester having weight average molecular weight of 30000 to 600000 obtained by reacting diols and dicarboxylic acids and (C) a triblock copolymer formed by polymerizing polylactic acids (A) to both ends of an amorphous polyester having weight average molecular weight of 10000 to 120000 obtained by reaction of diols and dicarboxylic acids (B). The weight ratio of the polylactic acid segment and the amorphous polyester segment (former:latter) is 98:2 to 51:49. |
