Patent ID: 6423766
Filing Date: 2002-07-23
Classification: C08L,H01M,Y02E

Abstract:
A flame-retardant polycarbonate resin composition comprising (A) a polycarbonate resin and (B) a composite rubber graft copolymer in a ratio by weight, (A):(B), falling between 99:1 and 92:8, and containing, relative to 100 parts by weight of the sum total of the component (A) and the component (B), (C) from 0.3 to 1.2 parts by weight, in terms of phosphorus, of a halogen-free phosphoric ester, and (D) from 0.01 to 1.0 part by weight of a polytetrafluoroethylene, in which the ratio by weight of the amount of the composite rubbery graft copolymer (B) to the phosphorus content of the halogen-free phosphoric ester (C) falls between 2 and 15, wherein the composite rubbery graft copolymer (B) is prepared by grafting a composite rubber, which has a structure composed of from 1 to 99% by weight of a polyorganosiloxane rubber component and from 1 to 99% by weight of a polyalkyl acrylate rubber components, the two components being so intertwisted with each other as not to separate from each other, and has a mean particle diameter of from 0.01 &mgr;m to 0.6 &mgr;m, with one or more vinyl monomers, wherein said composition contains essentially no inorganic filler and essentially no ABS resin.