Patent ID: 6737453
Filing Date: 2004-05-18
Classification: C08F,C08K,C08L

Abstract:
A flame retardant thermoplastic resin composition comprising:(A) 100 parts by weight of a rubber-reinforced thermoplastic resin comprising: a graft copolymer (A1) produced by graft-polymerizing a monomer component (b) containing an aromatic vinyl compound, a cyanided vinyl compound and, if required, the other copolymerizable monomer in the presence of a rubber polymer (a) containing polymer particles having a particle size of not more than 150 nm in an amount of 0 to 15% by weight, polymer particles having a particle size of from more than 150 to less than 350 nm in an amount of 60 to 100% by weight and polymer particles having a particle size of not less than 350 nm in an amount of 0 to 40% by weight, or a mixture of the graft copolymer (A1) and a copolymer (A2) of monomer component (bâ€²), said rubber-reinforced thermoplastic resin (A) having a graft ratio of 20 to 150% and a rubber polymer content of 8 to 20% by weight; and (B) 5 to 20 parts by weight of a phosphorus-based flame retardant comprising a condensed phosphoric acid ester, a phosphazene compound or mixture thereof, which condensed phosphoric acid ester is represented by the general formula (I): â€ƒwherein R1, R2, R3 and R4 are independently phenyl or xylenyl; X is a divalent group derived from resorcinol or bisphenol A; and n is 0.5 to 1.2.