Abstract: A thermoplastic resin composition having improved heat resistance, impact resistance and molding properties comprises a resin mixture of:(A) 5-95 wt. % of a polymer containing an unsaturated dicarboxylic anhydride and a vinyl aromatic compound and optionally a vinyl cyanide compound, an alkyl acrylate or methacrylate monomer and/or a rubber,(B) 95-5 wt. % of ABS resin containing 2-70 wt. % of a rubber component, and further containing and(C) 0.1-20 wt. %, per 80-99.9 wt. % of the sum of (A)+(B), of a modified thermoplastic acrylic resin which is a copolymer or a multi-stage polymer containing at least 20 wt. % of methyl methacrylate.

Abstract: A styrene-acrylonitrile resin composition having a good parting property comprising a styrene-acrylonitrile resin having blended therein, an .alpha.-olefin epoxide of the following formula: ##EQU1## wherein R and R' each is hydrogen or a straight-chain alkyl group, with the proviso that the sum of the carbon atoms in R plus R' is from 8 to 13, preferably 10 to 12.