Flame-retarding, polycarbonate moulding materials of high impact strength

Claim 1

A thermoplastic polycarbonate moulding material comprising: A. 50 to 90% by weight of a halogen-containing copolycarbonate containing 3 to 20% by weight of halogen formed from a dihydric phenol of the formula ##STR4## wherein Z is a single bond, C 1 -C 5 -alkylene, C 2 -C 5 -alkylidene, C 5 -C 6 -cycloalkylidene, --S-- or --SO 2 --, Hal is chlorine or bromine, x is 0, 1 or 2 and n is 1 or 0, the copolycarbonate containing 3 to 20% by weight of halogen in the form of co-condensed, halogenated, dihydric phenol, B. 10 to 50% by weight of a thermoplastic polymer formed from 50 to 95 parts by weight of styrene, α-methylstyrene, nuclear-substituted styrene or mixtures thereof and 5 to 50% by weight of (meth)acrylonitrile, C. 5 to 15 parts by weight, relative to 100 parts by weight of total weight of A. and B., of a phosphorous compound of the general formula ##STR5## wherein n is zero or 1, and when n is zero; R 1 , R 2 and R 3 independently of one another denote an unsubstituted or halogen-substituted C 1 to C 8 -alkyl, or a C 6 to C 20 -aryl which is unsubstituted or substituted by alkyl or halogen and when n is 1, R 1 , R 2 and R 3 independently of one another denote C 6 to C 20 -aryl which is unsubstituted or substituted by alkyl or halogen, and D. 0.05 to 2.0 parts by weight, relative to 100 parts by weight of total weight of A. and B., of a tetrafluoroethylene polymer having average particle sizes of 0.05 to 20 μm and a density of 1.2 to 1.9 g/cm 3 , the component D. being employed in the form of a coagulated mixture of emulsions of the tetrafluoroethylene polymers D. and emulsions consisting of not more than 3 parts by weight, but at least 0.1 parts by weight, relative to 100 parts by weight of the sum of the components A+B, of E. graft polymers formed from E.1. 5 to 90 parts by weight of a mixture of (i) 50 to 95% by weight of styrene, α-methylstyrene, nuclear-substituted styrene, methyl methacrylate or mixtures thereof (ii) 50 to 5% by weight of (meth)acrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleimide or mixtures thereof, grafted onto E.2. 95 to 10 parts by weight, of a rubber having a glass transition temperature T G ≧10° C., and the ratio by weight of the graft polymer E. to the tetrafluoroethylene polymer D. being between 95:5 and 60:40.