Thermoplastic moulding compositions having flame-retarding properties
First Claim
1. A thermoplastic moulding composition, containing(A) 50-90 parts by weight of a thermoplastic aromatic polycarbonate, based on the diphenols consisting essentially of the formula ##STR4## wherein A is a single bond, C1 -C5 -alkylene, C2 -C5 -alkylidene, C5 -C6 -cycloalkylidene, --S-- or --SO2 --, Hal is chlorine or bromine, x is 0, 1 or 2 and "n" is 1 or 0;
- (B) 10-50 parts by weight of a copolymer of random structure of
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Abstract
The present invention relates to flame-retarding moulding compositions which are based on thermoplastic polycarbonates, copolymers of styrenes and maleic anhydride, phosphorus compounds of the formula (I) ##STR1## tetrafluoroethylene polymers, small amounts of graft polymers and optionally halogen compounds and which in addition can contain stabilizers, pigments, flow agents, release agents and/or antistatics, and to a process for their preparation.
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Citations
17 Claims
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1. A thermoplastic moulding composition, containing
(A) 50-90 parts by weight of a thermoplastic aromatic polycarbonate, based on the diphenols consisting essentially of the formula ##STR4## wherein A is a single bond, C1 -C5 -alkylene, C2 -C5 -alkylidene, C5 -C6 -cycloalkylidene, --S-- or --SO2 --, Hal is chlorine or bromine, x is 0, 1 or 2 and "n" is 1 or 0; (B) 10-50 parts by weight of a copolymer of random structure of - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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2. 95-70% by weight of vinyl aromatic(s) selected from styrene, α
- -methylstyrene, nuclear-alkylated styrene and mixtures thereof and
2. 5-30% by weight of maleic anhydride, (C) 0-15 parts by weight of a low-molecular or high-molecular halogen compound, in each case relative to 100 parts by weight of components (A) and (B) and (C), the halogen content which results from the components (A) and (C) being in each case between 3 and 10% by weight, relative to the total weight of the components (A) and (C), characterized in that they additionally contain 1-20 parts by weight, relative to 100 parts by weight of components (A) and (B) and, if present, (C), of a phosphorous compound of the formula ##STR5## wherein R1, R2 and R3 independently of one another represent an optionally halogenated C6 -C20 -aryl radical and n and m independently of each other are 0 or 1, and (E) 0.05-2.0 parts by weight, relative to 100 parts by weight of (A) and (B) and, if present, (C), of a tetrafluoroethylene polymer with mean particle sizes of 0.05-20 μ
m and a density of 1.2-1.9/cm3, the component (E) being employed in the form of a coagulated mixture of emulsions of the tetrafluoroethylene polymers (E) with emulsions of graft polymers (F) obtained from(1) 5-90 parts by weight of a mixture of; (i) 50-95% weight of styrene, α
-methylstyrene, nuclear-substituted styrene, methyl methacrylate or mixtures thereof and(ii) 50-5% by weight of (meth)-acrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleimide or mixtures thereof on (2) 95-10 parts by weight of a rubber having a glass temperature TG of ≦
10°
C., and the weight ratio of (F)/(E) being between 95;
5 and 60;
40 and the content of component (F), relative to 100 parts by weight of (A) and (B) and, if present (C) being between 0.1 and 3.0 parts by weight.
- -methylstyrene, nuclear-alkylated styrene and mixtures thereof and
Specification