Thermoplastic molding materials based on polycarbonates, graft polymers and styrene/acrylonitrile copolymers

Thermoplastic molding material consisting essentially of:

• A) from 1 to 30% by weight of a polycarbonate,
• B) from 10 to 50% by weight of a graft polymer consisting essentially of
• b.sub.1) from 40 to 80% by weight based on the total weight of B), of a grafting base comprising an elastomeric polymer having a glass transition temperature of less than 10.degree. C. and
• b.sub.2) from 20 to 60% by weight based on the total weight of B), of a grafting shell comprising
• b.sub.21) from 50 to 95% by weight based on the total weight of b.sub.2), of styrene or substituted styrenes of the formula I ##STR3## where R.sup.1 is alkyl of 1 to 8 carbon atoms or hydrogen, R.sup.2 is alkyl of 1 to 8 carbon atoms and n is 0, 1, 2 or 3, or methyl acrylate or methyl methacrylate or a mixture thereof and
• b.sub.22) from 5 to 50% by weight of acrylonitrile, methacrylonitrile, maleic anhydride, maleimides N-substituted by C.sub.1 -C.sub.8 -alkyl or C.sub.6 -C.sub.20 -aryl, or a mixture thereof,
• C) from 5 to 80% by weight of a thermoplastic copolymer comprising
• C.sub.1) from 50 to 85% by weight based on the total weight of C), of styrene or substituted styrenes of the general formula I or of a mixture thereof and
• C.sub.2) from 15 to 50 % by weight based on the total weight of C), of acrylonitrile or of a mixture thereof and
• D) from 10 to 45% by weight of a thermoplastic copolymer which differs from component C) and consists essentially of
• d.sub.1) from 50 to 85% by weight based on the total weight of D), of styrene or substituted styrenes of the general formula I or of a mixture thereof and
• d.sub.2) from 15 to 50% by weight based on the total weight of D), of acrylonitrile or methacrylonitrile or of a mixture thereof,
• with the proviso that the amount by weight, based on the total weight of component D), of component d.sub.2) is at least 5% by weight-lower than the amount by weight, based on the total weight of component C), of component c.sub.2).