Patent ID: 8119726

Claim:
A flame retardant thermoplastic resin composition comprising: (A) about 45 to 95 parts by weight of a thermoplastic polycarbonate resin; (B) about 1 to 50 parts by weight of a rubber modified vinyl graft copolymer prepared by graft-polymerizing (b 1 ) about 5 to 95% by weight of a monomer mixture consisting of 40 to 95% by weight of styrene, α-methylstyrene, halogen- or alkyl-substituted styrene, C 1-8 methacrylic acid alkyl ester, C 1-8 acrylic acid alkyl ester, or a mixture thereof and 5 to 60% by weight of acrylonitrile, methacrylonitrile, C 1-8 methacrylic acid alkyl ester, C 1-8 acrylic acid alkyl ester, maleic acid anhydride, C 1-4 alkyl- or phenyl N-substituted maleimide or a mixture there of onto (b 2 ) about 5 to 95% by weight of a rubber polymer selected from the group consisting of butadiene rubber, acryl rubber, ethylene-propylene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, isoprene rubber, copolymer of ethylene-propylene-diene (EPDM), polyorganosiloxane-polyalkyl (meth)acrylate rubber complex and a mixture thereof; (C) about 0 to 50 parts by weight of a vinyl copolymer prepared by copolymerizing (c 1 ) about 50 to 95% by weight of styrene, α-methylstyrene, halogen- or alkyl-substituted styrene, C 1-8 methacrylic acid alkyl ester, C 1-8 acrylic acid alkyl ester, or a mixture thereof and (c 2 ) about 5 to 50% by weight of acrylonitrile, methacrylonitrile, C 1-8 methacrylic acid alkyl ester, C 1-8 acrylic acid alkyl ester, maleic acid anhydride, C 1-4 alkyl- or phenyl N-substituted maleimide or a mixture thereof; (D) about 1 to 30 parts by weight of a mixture of oligomeric phosphoric acid ester compounds consisting of (d 1 ) about 5 to 99% by weight of an oligomeric phosphoric acid ester compound derived from bisphenol-A represented by the following Formula (II) or a mixture thereof: wherein each R 1 is unsubstituted C 6-20 aryl, m is an integer representing the number of repeating units of 1 to 5, and the average value of m in the mixture of the bisphenol A-derived oligomeric phosphoric acid ester is 1 to 3; and (d 2 ) about 1 to 95% by weight of an oligomeric phosphoric acid ester compound , derived from resorcinol represented by the following Formula (III) or a mixture thereof, per 100 parts by weight of the sum of (A), (B) and (C): wherein R 2 is independently C 6-20 aryl group or an alkyl-substituted C 6-20 aryl group, n is an integer representing the number of repeating units of 1 to 5, and the average value of n in the mixture of the resorcinol-derived oligomeric phosphoric acid ester is 1 to 3; and (E) about 0.05 to 5 parts by weight of a fluorinated polyolefin resin, per 100 parts by weight of (A)+(B)+(C).