Thermoplastic resin compositions comprising copolymer of unsaturated dicarboxylic acid anhydride and vinyl aromatic monomer, ABS, and methylmethacrylate polymer

A thermoplastic molding composition which consists essentially of a blend of

• (A) from 5 to 95 wt. % of a copolymer consisting essentially of
• (1) from 5 to 50 wt. % of an unsaturated dicarboxylic acid anhydride,
• (2) from 50 to 95 wt. % of a vinyl aromatic monomer,
• (3) from 0 to 30 wt. % of a vinyl cyanide monomer, alkyl acrylate monomer or alkyl methacrylate monomer, and
• (4) from 0 to 50 wt. % of a rubber
• (B) from 5 to 95 wt. % of an ABS resin containing from 2 to 70 wt. %, based on said ABS resin, of a butadiene rubber, and
• (C) from 0.1 to 20 wt. %, per 80 to 99.9 wt. % of the sum of the amounts of (A) plus (B), of thermoplastic acrylic resin different from (A) and (B) and which is a copolymer or multi-stage polymer containing at least 20 wt. % of methyl methacrylate, based on said acrylic resin.