Thermoplastic moulding compositions consisting of polycarbonates, graft polymers and copolymers

A thermoplastic moulding composition containing

• (A) 20 to 80 parts by weight of an aromatic, thermoplastic polycarbonate based on diphenols of the general formula ##STR5## wherein A denotes a single bond, a C.sub.1 -C.sub.5 -alkylene, a C.sub.2 -C.sub.5 -alkylidene, a C.sub.5 -C.sub.6 -cycloalkylidene, --S-- or --SO.sub.2 --,
• Hal denotes chlorine or bromine,
• x is 0, 1 or 2 and
• n is 1 or zero,
• (B) 10 to 60 parts by weight of graft polymer(s) (B.1), (B.2) or both, where
• (B.1) is obtainable by grafting 5 to 90 parts of a mixture of
• (i) 30 to 40% by weight .alpha.-methylstyrene, 52 to 62% by weight methyl methacrylate and 4 to 14% by weight acrylonitrile, the sum of the percentages by weight being 100 in each case, onto
• (ii) 95 to 10 parts by weight of a rubber having a glass transition temperature T.sub.G .ltoreq.10.degree. C., and where
• (B.2) is obtainable by grafting 5 to 90 parts by weight of a mixture of
• (i) 50 to 95% by weight of styrene, .alpha.-methylstyrene, styrene which is substituted in the nucleus, methyl methacrylate or mixtures of these, and
• (ii) 5 to 50% by weight of (meth)acrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleimide or mixtures of these onto
• (iii) 95 to 10 parts by weight of a rubber having a glass transition temperature T.sub.G .ltoreq.10.degree. C., and
• (C.) 10 to 70 parts by weight of thermoplastic copolymer(s) (C.1), (C.2) or both, where
• (C.1) is obtainable by copolymerisation of 30 to 40% by weight of .alpha.-methylstyrene, 52 to 62% by weight methyl methacrylate and 4 to 14% by weight acrylonitrile, the sum of the percentages by weight again being 100 in each case, and where
• (C.2) is obtainable by copolymerisation of
• (i) 50 to 95% by weight of styrene, .alpha.-methylstyrene, styrene which is substituted in the nucleus, methyl methacrylate or mixtures of these and
• (ii) 5 to 50% by weight of (meth)acrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleimide or mixtures of these,
• where
• 1. the sum of the number of parts by weight of components (A)+(B)+(C) is always 100,
• 2. where polymers (B.1) and (B.2) are present simultaneously, the weight ratio of (B.1) to (B.2) is between 50:50 and 95:5,
• 3. where polymers (C.1) and (C.2) are present simultanteously, the weight ratio of (C.1) to (C. 2) is also between 50:50 and 95:5, and
• 4. either (B.1) or (C.1), or both (B.1) and (C.1) must be present in the moulding composition.