Moldable resin compositions containing polycarbonate styrene polymer and three phase graft polymer

A thermoplastic moldable resin composition, the resin components of which consist essentially of a blend of

• I. 100 parts by weight of a mixture comprising
• (A) from 95 to 5 parts by weight of an aromatic vinyl polymer, and
• (B) from 5 to 95 parts by weight of thermoplastic polycarbonate resin, and
• II. from 1 to 20 parts by weight of
• (C) a three-stage polymer produced by three, sequential, emulsion polymerization stages, wherein
• (1) in the first emulsion polymerization stage, a mixture of (a) from 50 to 100 percent by weight of first, aromatic, vinyl monomer, (b) from 0 to 50 percent by weight of second, vinyl monomer different from said first monomer and copolymerizable therewith and (c) from 0 to 10 percent by weight of a multifunctional bridge-forming monomer, is emulsion polymerized to obtain a first stage polymer,
• (2) in the second emulsion polymerization stage, a mixture of (a) said first stage polymer and (b) a monomer mixture of (i) from 50 to 100 percent by weight of butadiene, (ii) from 0 to 50 percent by weight of a third, vinyl monomer copolymerizable with said butadiene, and (iii) from 0 to 1 percent by weight of a multifunctional bridge-forming monomer, is emulsion polymerized to obtain a second stage polymer, and
• (3) in the third emulsion polymerization stage, a mixture of (a) said second stage polymer and (b) a monomer mixture of (i) from 50 to 100 percent by weight of an alkyl methacrylate having 1 to 4 carbon atoms in the alkyl group, (ii) from 0 to 50 percent by weight of a fourth, vinyl monomer different from said alkyl methacrylate and copolymerizable therewith, and (iii) from 0 to 10 percent by weight of a multifunctional bridge-forming monomer, is emulsion polymerized.