Thermoplastic fire retardant composition

An improved flame-resistant thermoplastic moulding composition composed of at least one vinylchloride polymer and grafted copolymers of a vinyl aromatic compound and a nitrile on a rubber-like polymer, said composition having the following components:

• A. 20 to 80 parts by weight of vinylchloride polymer;
• B. 80 to 20 parts by weight of a mixture of
• B-1. 30 wt. % to 100 wt. % of a grafted copolymer obtained by
• B-1-1. polymerization of a monomer mixture of up to 0 wt. % to 70 wt. % of acrylonitrile and/or methacrylonitrile, and 100 wt. % to 25 wt. % of styrene and/or .alpha.-methylstyrene in the presence of
• B-1-2. a synthetic rubber-like polymer, the weight ratio between the monomer mixture and the rubber-like polymer being between 1:10 and 10:1;
• and
• B-2. 0 to 70 wt. % of a copolymer obtained by polymerization of a mixture of
• B-2-2. 0 wt. % to 75 wt. % of acrylonitrile and/or methacrylonitrile, and
• B-2-2. 100 wt. % to 25 wt. % of styrene and/or .alpha.-methylstyrene;
• and with
• C. 0.05 parts to 5 parts by wt. relative to 100 parts by wt. of (A+B) of a zinc titanate, wherein the zinc titanate consists of at least 50% by weight of zinc titanate having the spinel structure, and selected from the class of zinc titanium (IV) oxide or a mixture of zinc oxide and titanium (IV) oxide compounds.