POLYLACTIC ACID RESIN COMPOSITION, PROCESS FOR PRODUCING THE SAME, AND MOLDED PRODUCT COMPRISING THE SAME

摘要

There is provided a polylactic acid resin composition, comprising 0.15 to 0.90 parts by weight of an organic nucleating agent (B) in addition to 100 parts by weight of a polylactic acid resin (A) comprised of a poly-L-lactic acid component and a poly-D-lactic acid component. The polylactic acid resin composition satisfies the following (i) to (v):
(i) amount of a linear oligomer of L-lactic acid and/or D-lactic acid is equal to or less than 0.3 parts by weight
(ii) rate of weight-average molecular weight retention is equal to or greater than 70% after the polylactic acid resin composition is retained in a closed state at 220°C for 30 minutes;
(iii) degree of stereocomplexation (Sc) exceeds 80%;
(vi) stereocomplex crystal melting heat quantity ”Hmsc is equal to or greater than 30 J/g; and
(v) cooling crystallization heat quantity (”Hc) is equal to or greater than 20 J/g.