ABS MOULDING MATERIALS WITH IMPROVED BURNING PROPERTIES AND PROCESS FOR THEIR PRODUCTION

摘要

// This invention relates to flame-resistant ABS moulding material comprising: I) 95 to 35 parts by weight of one or more matrix resin polymers of a thermoplastic copolymer of styrene and acrylonitrile in which, if required, all or some of the styrene is replaced by .alpha.-methylstyrene, a nuclear-alkylated styrene, a nuclear-halogenated styrene, methyl methcrylate, maleic anhydride or substituted or unsubstituted maleimide and all or some of the acrylonitrile is replaced by methacrylonitrile. II) 5 to 65 parts by weight of one or more graft polymers of a product formed when at least one of the monomers listed under I is polymerised in the prsence of a rubber-like polymer graft base. III) 0.05 to 0.5 parts by weight of a tetrafluoroethylene polymer, IV) 0 to 8% by weight (based on I + II + III) of an inorganic flameproofing synergist, and V) 0 to 25% by weight (based on I + II + III) of at least one organic halogen compound, having been prepared by a process comprising mixing an aqueous dispersion of component III with a latex of component II or a latex of component I or a latex mixture of components I and II, isolating the polymer mixture by coagulation and then incorporating components IV and V and, if appropriate, further graft polymer II and/or resin polymer I.