Patent ID: 6906123

Claim:
A flameproof thermoplastic resin composition substantially free of phenolic resin, red phosphorous and silicone resin comprising (A) about 40-95 parts by weight of a rubber modified styrene-containing graft copolymer resin, (B) about 5-60 parts by weight of polyphenylene ether resin; (C) about 5-30 parts by weight of aromatic phosphoric acid ester per 100 part by weight of (A) and (B), wherein the rubber modified styrene-containing resin (A) comprises a styrene-containing graft copolymer resin comprising a) about 10-60% by weight rubber and b) about 90-40% by weight of a styrene-containing copolymer grafted onto the rubber wherein the styrene-containing copolymer contains about 15-40% by weight of acrylonitrile and wherein the styrene-containing copolymer chains in rubber modified styrene-containing resin (A) comprise (i) about 5-20% by weight having an acrylonitrile fractionation content of 0-9% by weight (ii) about 10-40% by weight having an acrylonitrile fractionation content of 9-20% by weight and (iii) about 40-80% by weight having an acrylonitrile fractionation content of not less than 20% by weight acrylonitrile and the sum of (i), (ii), and (iii) is 100% by weight of the total weight of styrene-containing copolymer chains in rubber modified styrene-containing resin (A).