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

A thermoplastic molding material containing, as essential components,

• A) from 10 to 88.9% by weight of at least one polycarbonate,
• B) from 30 to 70% by weight of a coarse-particled graft copolymer which has a median particle size of from 200 to 700 nm (d.sub.50 value of the integral mass distribution) and from 70 to 30% by weight of a finely divided graft copolymer which has a median particle size of from 50 to 180 nm (d.sub.50 value of the integral mass distribution) consisting of
• b.sub.1) from 40 to 80% by weight of a grafting base of an elastomeric polymer based on alkyl acrylates where the alkyl radical is of 1 to 8 carbon atoms and having a glass transition temperature below 10.degree. C. and
• b.sub.2) from 20 to 60% by weight of a graft of
• b.sub.21) from 50 to 95% by weight of styrene or a substituted styrene of the formula I ##STR3## where R is alkyl of 1 to 8 carbon atoms or hydrogen, R.sup.1 is alkyl of 1 to 8 carbon atoms and n is 0, 1, 2 or 3, or a C.sub.1 -C.sub.8 -alkyl (meth)acrylate or a mixture thereof and
• b.sub.22) from 5 to 50% by weight of acrylonitrile, methacrylonitrile, C.sub.1 -C.sub.8 -alkyl (meth)acrylates, maleic anhydride or maleimides N-substituted by C.sub.1 -C.sub.8 -alkyl or C.sub.6 -C.sub.20 -aryl groups or a mixture thereof,
• C) from 1 to 79.9% by weight of a thermoplastic copolymer of
• c.sub.1) from 50 to 95% by weight of a styrene or substituted styrene of the formula I or a C.sub.1 -C.sub.8 -alkyl (meth)acrylate or a mixture thereof and
• c.sub.2) from 5 to 50% by weight of acrylonitrile, methacrylonitrile, C.sub.1 -C.sub.8 -alkyl (meth)acrylates, maleic anhydride or maleimides N-substituted by C.sub.1 -C.sub.8 -alkyl or C.sub.6 -C.sub.20 -aryl groups or a mixture thereof,
• D) from 0.1 to 40% by weight of at least one polyolefin and
• E) from 0 to 50% by weight of a fibrous or particulate filler or a mixture thereof.