Patent ID: 6579911
Filing Date: 2003-06-17
Classification: C08J,C08K

Abstract:
A flame retardant foamed polymer composition comprising:a) a styrene polymer which is polystyrene or a copolymer of styrene monomer and copolymerizable ethylenically unsaturated comonomer(s) selected from the group consisting essentially of &agr;-methylstyrene, acrylonitrile, acrylic or methacrylic acids having one to eight carbon atoms, esters of acrylic or methacrylic acid with alcohols having one to eight carbon atoms, fumeric esters having one to eight carbon atoms, maleic anhydride and a small amount of divinylbenzene, and b) a fire retardant formulation comprising: 1) hexabromocyclododecane in an amount less than about 2.5% by weight based on 100% of styrene polymer and 2) a phosphorous compound in an amount from about 0.1% to about 4.0% by weight based on 100% of styrene polymer wherein the phosphorous compound is selected frown 1) phosphates selected from triphenylphosphate, tributylphosphate, triethylphosphate, trimethylphosphate, tripropylphosphate, trioctylphosphate, diphenyl methylphosphate, tris-(2-ethylhexyl)phosphate, isodecyl diphenylphosphate, isooctyl diphenylphosphate, bisphenyl diphenylphosphate, trixylyl phosphate or triisopropylphenylphenylphosphate; 2) phosphonates of the formula (RO)2RPO; 3) phosphinates of the formula (RO)R2PO; 4) phosphine oxides of the formula R3PO; 5) phosphines of the formula R3P; and 6) phosphonium salts of the formula R4PX, wherein each R is independently selected from substituted or unsubstituted, saturated or unsaturated, branched or straight-chain aliphatic moieties or substituted or unsubstituted aromatic moieties and X is a suitable counter ion.