Fire-resistant synthetic resin composition containing a polycarbonate, a phosphorous fireproofing additive, and possibly other additives and/or fillers, and articles made from this composition

Claim 1

A fire-resistant synthetic resin composition, containing a polycarbonate, a non-reactive fireproofing additive derived from phosphonic acid, and possibly other additives and/or fillers, and characterized by the fact that the fireproofing additive has the general formula ##STR23## where Y is a q-valent organic radical, derived, by the loss of q hydrogen atoms, from one of the group consisting of cycloalkanes containing 6 to 8 carbon atoms, benzene hydrocarbons containing 6 to 12 carbon atoms, di- or trinuclear aromatic hydrocarbons with enchained nuclei containing 12 to 20 carbon atoms, di- or trinuclear aromatic hydrocarbons with condensed nuclei containing 10 to 20 carbon atoms, aromatic compounds with the formula Ar-Z-Ar, in which Ar is a monovalent aryl radical containing 6 to 12 carbon atoms, and Z represents --S--, --O--, --SO 2 --, --SO--, --CO--, and brominated or chlorinated derivatives of such aromatic hydrocarbons and compounds; q is a number equal to 1, 2, 3; n is a number equal to 0, 1, 2; R is an alkyl radical containing 1 to 6 carbon atoms, a phenyl radical or a cyclohexyl radical; and M is an atom of an alkaline metal belonging to the group comprising Li, Na and K, the concentration of this additive in the polycarbonate being between 0.01 and 0.4 weight%.