Patent ID: 7999021

Claim:
A resin composition comprising a styrene-based resin (A), a polylactide (B), a compatibilizer (C) and a dicarboxylic anhydride (D), wherein the compatibilizer (C) is at least any one species described below: (C-1) a methyl methacrylate polymer; (C-2) a vinyl-based polymer to which 3 wt % or more of glycidyl ester of unsaturated carboxylic acid unit or unsaturated dicarboxylic anhydride unit is copolymerized; (C-3) a graft polymer in which 20 to 90 wt % of methyl methacrylate unit is grafted to 10 to 80 wt % of a rubbery polymer; and (C-4) a block copolymer in which polylactide segment represented by general formula (I) and vinyl-based polymer segment represented by general formula (II) are bonded in a copolymerization ratio ((I)/(II)) of 99/1 to 1/99 wt parts such that (I)+(II) is 100 wt parts, wherein weight average molecular weights of (C-1) and (C-2) are within a range of 10,000 to 450,000 and a range of 1,000 to 10,000, respectively, wherein X is at least one species selected from hydrogen, alkyl group, hydroxyl group, alkyl ester group, cyano group, phenyl group, amido group and halogen group, m and n denote number average molecular weight, and are 1000 to 100,000, respectively, and wherein amounts of the compatibilizer (C) and the dicarboxylic anhydride (D) are 0.01 to 60 weight parts and 0.05 to 5 weight parts based on 100 parts in total of the resin (A) and the polylactide (B), respectively.