Thermoplastic resin compositions containing mixtures of cyclic phosphazenes and phosphoric acid esters

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 (b1) 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-substituted styrene, alkyl-substituted styrene, C1-8 methacrylic acid alkyl ester, C1-8 acrylic acid alkyl ester, or a mixture thereof and about 5 to 50% by weight of acrylonitrile, methacrylonitrile, C1-8 methacrylic acid alkyl ester, C1-8 acrylic acid alkyl ester, maleic acid anhydride, or C1-4 alkyl- or phenyl N-substituted malcimide onto (b2) about 5 to 95 parts by weight of a rubber polymer 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 (FPDM), polyorganosiloxane-polyalkyl (meth)acrylate rubber or a mixture thereof;
• (C) about 0 to 50 parts by weight of a vinyl copolymer polymerized with (c1) about 50 to 95% by weight of at least one of styrene, α-methylstyrene, halogen- or alkyl-substituted styrene, C1-8 methacrylic acid alkyl ester, or C1-8 acrylic acid alkyl ester and (c2) about 5 to 50% by weight of at least one of acrylonitrile, methacrylonitrile, C1-8 methacrylic acid alkyl ester, C1-8 acrylic acid alkyl ester, maleic acid anhydride, and C1-4 alkyl-maleimide or phenyl N-substituted maleimide;
• (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 (d1) about 1 to 50% by weight of a cyclic phosphazene represented by the following formula;
• where R1 is alkyl, aryl, alkyl substituted aryl, aralkyl, alkoxy, aryloxy, amino or hydroxyl, k and m are an integer from 1 to 10, R2 is dioxyarylene group of C6-30 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 mixture of the phosphazene compound is 0.3 to 3;
• and
• (d2) about 99 to 50% by weight of a phosphoric acid ester represented by the following formula;
• where R3, R4, R6 and R7 are a C6-20 aryl group or an alkyl-substituted C6-20 aryl group, respectively;
• R5 is a C6-30 arylene group or an alkyl-substituted C6-30 arylene group;
• and l means the number of repeating unit and the average value of l in the phosphate mixture is 0 to 3;
• and
• (F) 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/cm3, per 100 parts by weight of (A)+(B)+(C).