Molding compositions of polycarbonate and polyalkylene terephthalate showing improved joint line strength

Claim 1

Thermoplastic molding compositions comprising: A. 10 to 95% by weight aromatic polycarbonate, B. 5 to 90% by weight polyalkylene terephthalate and C. 1 to 70% by weight graft polymer, the above percentages being based in each case on the sum of components A and B, characterized in that component C is a graft polymer of 5 to 90 parts by weight of a graft overlay of C.1 or C.2 or a C.1-C.2 mixture wherein: C.1 is a mixture, based on the weight of component C.1 of 30 to 40% by weight α-methyl styrene, 52 to 62% by weight methyl methacrylate and 4 to 14% by weight 2 crylonitrile; C.2 is a mixture of C.2.1 50 to 95 parts by weight styrene, α-methyl styrene, C 1 -C 4 alkyl- or halogen-nucleus-substituted styrene, methyl methacrylate or mixtures thereof and C.2.2 5 to 50 parts by weight acrylontrile, methacrylonitrile, methylmethacrylate, maleic anhyride, C 1 -C 4 alkyl- or phenyl-N-substituted maleic imide or mixtures thereof and additionally C.2.3, C.2.4 or a C.2.3-C.2.4 mixture wherein: C.2.3 is 1 to 40 parts by weight acrylic acid ester of a primary or secondary monohydric aliphatic C 2 -C 10 alcohol and C.2.4 is 0.1 to 10 parts by weight acrylic or methacrylic acid ester of tert.-butanol grafted on to C.3 10 to 95 parts weight of a polymer having a glass transition temperature below -10° C.