Polycarbonate/ABS molding compounds

Thermoplastic molding compounds containing

• A. 5 to 95 parts by weight of an aromatic polycarbonate,
• B. 1 to 50 parts by weight of a vinyl copolymer of
• B.1 50 to 99 parts by weight styrene, .alpha.-methyl styrene, nucleus-substituted styrenes, methyl methacrylate or mixtures thereof and
• B.2 1 to 50 parts by weight (meth)acrylonitrile, methyl methacrylate, maleic anhydride, N-alkyl- or N-aryl-substituted maleic imide or mixtures thereof
• and
• C. 5 to 95 parts by weight of one or more graft polymers obtained by graft polymerization of
• C.1 5 to 95 parts by weight of a mixture of
• C.1.1 50 to 99 parts by weight styrene, .alpha.-methyl styrene, nucleus-substituted styrenes, C.sub.1-8 alkyl methacrylates, C.sub.1-8 alkyl acrylates or mixtures thereof and
• C.1.2 1 to 50 parts by weight acrylonitrile, methacrylonitrile, C.sub.1-8 alkyl methacrylates, C.sub.1-8 alkyl acrylates, maleic anhydride, C.sub.1-4 alkyl- or phenyl-N-substituted maleic imides or mixtures thereof on
• C.2 5 to 95 parts by weight of a crosslinked, particulate elastomeric graft base having an average particle diameter (d.sub.50 value) of 0.05 to 5 .mu.m and a glass transition temperature of <10.degree. C., the sum of the parts by weight of A, B and C being 100 parts by weight,
• characterized in that 10 to 100% of component A is replaced by a mixture of two polycarbonates A.1 and A.2 of identical structure,
• 1) the relative solution viscosity of A.1 being 1.18 to 1.24,
• 2) the relative solution viscosity of A.2 being 1.24 to 1.34 and
• 3) the difference between the relative solution viscosities of A.1 and A.2 being greater than or equal to 0.06 relative solution viscosities being measured in CH.sub.2 Cl.sub.2 as solvent at 25.degree. C. and at a concentration of 0.5 g polycarbonate/100 ml of solvent.