Flame resistant polycarbonate/ABS moulding compounds resistant to stress cracking

A flame resistant thermoplastic molding compound having improved stress resistance, consisting essentially of:

• A) 40-98 parts by weight of aromatic polycarbonate;
• B) 3-50 parts by weight of styrene/acrylonitrile copolymer;
• C) 0.5 to 40 parts by weight of a graft polymer of styrene and acrylonitrile on particulate, crosslinked polybutadiene rubber;
• D) 0.5 to 20 parts by weight of a mixture of:
• D.1.) 14 to 40%, based on D), of triphenyl phosphate;
• D.2.) 86 to 60%, based on D), of m-phenylene-bis(diphenylphosphate);
• and
• E) 0.05 to 5 parts by weight of tetrafluoroethylene polymer.

Flame resistant, thermoplastic mounding compounds containing

• A) 40 to 98 parts by weight of an aromatic polycarbonate;
• B) 3 to 50 parts by weight of a vinyl copolymer prepared from
• B.1) 50 to 98 parts by weight of styrene, .alpha.-methylstyrene, ring-substituted styrenes, C.sub.1 -C.sub.8 alkyl methacrylates, C.sub.1 -C.sub.8 alkyl acrylates or mixtures thereof and
• B.2) 50 to 2 parts by weight of acrylonitrile, methacrylonitrile, C.sub.1 -C.sub.8 alkyl methacrylates, C.sub.1 -C.sub.8 alkyl acrylates, maleic anhydride, N-substituted maleimides and mixtures thereof;
• C) 0.5 to 40 parts by weight of a graft polymer prepared from
• C.1) 5 to 95 parts by weight of a mixture of
• C.1.1.) 50 to 95 parts by weight of styrene, .alpha.-methylstyrene, halogen or methyl ring-substituted styrene, C.sub.1 -C.sub.8 alkyl methacrylate C.sub.1 -C.sub.8 alkyl acrylate, or mixtures of these compounds and
• C.1.2.) 5 to 50 parts by weight of acrylonitrile, methacrylonitrile, C.sub.1 -C.sub.8 alkyl methacrylates C.sub.1 -C.sub.8 alkyl acrylate, maleic anhydride, C.sub.1 -C.sub.4 alkyl or phenyl N-substituted maleimides or mixtures of these compounds on
• C.2) 5 to 95 parts by weight of a polymer with a glass transition temperature of below -10.degree. C.
• D) 0.5 to 20 parts by weight of a mixture of
• D.1) 10 to 90 wt. %, related to D), of a monophosphorus compound of the formula (I) ##STR11## in which R.sup.1, R.sup.2 and R.sup.3 mutually independently mean optionally halogenated C.sub.1 -C.sub.8 alkyl, C.sub.6 -C.sub.20 aryl or C.sub.7 -C.sub.12 aralkyl
• n means 1 and
• D.2) 90 to 10 wt. %, related to D), of an oligomeric phosphorus compound of the formula (II) ##STR12## in which R.sup.4, R.sup.5, R.sup.6, R.sup.7 are mutually independently cresyl, phenyl, xylenyl, propylphenyl or butylphenyl, or brominated or chlorinated derivatives thereof
• n means 1,
• Y means an average value between 1 and 2, and
• X means a residue derived from resorcinol or hydroquinone,
• and
• E) 0.05 to 5 parts by weight of a fluorinated polyolefin with an average particle diameter of 0.05 to 1000 .mu.m, a density of 1.2 to 2.3 g/cm.sup.3 and a fluorine content of 65 to 76 wt. %.