Patent ID: 6890979

Claim:
A thermoplastic molding compositions comprising A) 5 to 95 parts by wt. of at least one member selected from the group consisting of aromatic polycarbonate and polyester carbonate, B) 1 to 50 parts by wt. of at least one graft rubber, obtained by emulsion polymerization of styrene and acrylonitrile in the weight ratio 90:10 to 50:50, wherein styrene and/or acrylonitrile may be replaced wholly or partly by α-methylstyrene, methyl methacrylate or N-phenylmaleinimide, in the presence of at least two rubber lattices of type (B1) and (B2) which contain in each case 0 wt. % to 50 wt. % of a further vinyl comonomers in copolymerized form, and wherein the weight ratio of monomers used to rubber lattices used is 25:75 to 70:30, characterized in that the rubber latex (B1) has a particle diameter d 50 of ≦350 nm, a particle size distribution range (measured as d 90 -d 10 from the integral particle size distribution) from 30 nm to 100 nm, and a gel content of ≦70 wt. %, and the rubber latex (B2) has a particle diameter d 50 of ≧350 nm, a particle size distribution range (measured as d 90 -d 10 from the integral particle size distribution) from 50 nm to 500 nm, and a gel content of ≧70 wt. %, and the difference in the average particle diameter of B1 and B2 is ≧50 nm, C) 0 to 50 parts by wt. of at least one thermoplastic homo-, co- or terpolymer containing at least one monomer selected from the group consisting of styrene, α-methylstyrene, acrylonitrile, methyl methacrylate and N-substituted maleinimide, D) 0.5 to 25 parts by wt. of at least one flame retardant selected from the group consisting of compounds conforming to formula (III) wherein R 12 , R 13 and R 14 independently of one another, mean an optionally halogenated C 1 -C 8 -alkyl or an optionally halogenated and/or alkylated C 5 or C 6 -cycloalkyl or an optionally halogenated and/or alkylated and/or aralkylated C 6 -C 30 -aryl, n and m independently of one another, are 0 or 1, and compounds corresponding to formula (IV) wherein R 15 , R 16 , R 17 , R 18 independently of one another, mean C 1 -C 8 -alkyl, C 5 -C 6 -cycloalkyl, C 6 -C 10 -aryl, C 7 -C 12 -aralkyl, n independently of one another, means 0 or 1, N means 1 to 5 and X means a mono- or polynuclear aromatic radical having 6 to 30 carbon atoms, and optionally at least one conventional additive, the sum of the parts by weight of the components totaling 100.