Patent ID: 7550523

Claim:
A flame retardant thermoplastic resin composition comprising: (A) about 45 to 95 parts by weight of a polycarbonate resin; (B) about 1 to 50 parts by weight of a rubber modified vinyl-grafted copolymer prepared by graft-polymerizing (b 1 ) about 5 to 95 parts by weight of a monomer mixture of about 50 to 95% by weight of at least one 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 about 5 to 50% by weight of acrylonitrile, methacrylonitrile, C 1-8 methylacrylic acid alkyl ester, C 1-8 acrylic acid alkyl ester, maleic acid anhydride, or C 1-4 alkyl- or phenyl N-substituted maleimide or a mixture thereof onto (b 2 ) about 5 to 95 parts by weight of a rubber wherein the rubber polymer is 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 or a mixture thereof; (C) about 0 to 50 parts by weight of a vinyl copolymer polymerized with (c 1 ) about 50 to 95% by weight of at least one of styrene, α-methylstyrene, halogen-substituted styrene, 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 at least one of acrylonitrile, methacrylonitrile, C 1-8 methacrylic acid alkyl ester, C 1-8 acrylic acid alkyl ester, maleic acid anhydride, C 1-4 alkyl-maleimide or phenyl N-substituted maleimide or a mixture thereof; (D) about 1 to 30 parts by weight of a phosphorous mixture, as a flame retardant, per 100 parts by weight of (A)+(B)+(C), of (d 1 ) about 1 to 50% by weight of a cyclic phosphazene oligomer compound or a mixture thereof represented by the following formula: where R 1 is alkyl, aryl, alkyl substituted aryl, aralkyl, alkoxy, aryloxy, amino or hydroxyl, k and m are an integer from 1 to 10, R 2 is dioxyarylene group of C 6-30 or a derivative thereof, and n is 0 or an integer representing the number of repeating unit and the average value of n in the phosphazene mixture is 0.3 to 3; and (d 2 ) about 99 to 50% by weight of a phosphate ester morpholide represented by the following formula; where R 3 is a C 6-20 aryl group or an alkyl-substituted C 6-20 aryl group, R 4 is a C 6-30 arylene group or an alkyl-substituted C 6-30 arylene group, is 1 or 2, and x and y are 0 or integers representing the number of corresponding units and the average value of (x+y) in the mixture of phosphate ester morpholide compounds is 0 to 5; and (E) about 0.05 to 5.0 parts by weight of a fluorinated polyolefin resin with average particle size of about 0.05 to 1000 μm and density of about 1.2 to 2.3 g/cm 3 , per 100 parts by weight of (A)+(B)+(C).