Patent ID: 7550541

Claim:
A resin composition comprising from 40 to 60 parts by weight of a polylactic acid resin and from 40 to 60 parts by weight of a polyacetal resin relative to 100 parts by weight of the total of the polylactic acid resin and the polyacetal resin, and further comprising a core/shell multi-layered polymer which is composed of a core layer and one or more shell layers that cover it and in which the neighboring layers are formed of different types of polymers; the formaldehyde content of the composition being less than 500 ppm relative to the polyacetal resin; wherein a lactic acid component of the polylactic acid resin includes not less than 95% of an L-isomer or not less than 95% of a D-isomer, the polylactic acid resin and the polyacetal resin in the resin composition are miscible with each other, and the crystallization temperature during cooling caused by the polyacetal resin in the resin composition is lower than the crystallization temperature during cooling of the polyacetal resin alone.