Patent ID: 6815476
Filing Date: 2004-11-09
Classification: C08K,C08L

Abstract:
A moldable flame retardant thermoplastic resin composition comprising in admixture a moldable thermoplastic resin and a sufficient amount of a flame retardant to render the composition flame retardant which flame retardant consists essentially of, in combination, about 10 to about 90 weight % of a low molecular weight aromatic phosphate ester having a molecular weight of at least about 500 and about 90 to about 10 weight % of a high molecular weight aromatic phosphate ester having a molecular weight of at least about 5000, providing that the molecular weights do not overlap each other, wherein both said low molecular weight aromatic phosphate ester and said high molecular weight aromatic phosphate ester are of the following formula: wherein R1, R2, R3 and R4 are independently selected from the group consisting of an aryl or an alkyaryl group, X is derived from Bisphenol-A; m is an integer of from 0 and 1; O is oxygen; P is phosphorus; n of said low molecular weight aromatic phosphate ester is an integer of from 1 to 5; and n of said high molecular weight aromatic phosphate ester is an integer of from 6 to 35; wherein molded articles from said composition have a matched Izod of at least about 5.0 ft.-lbs/in. as determined in accordance with ASTM D 256, a heat deflection temperature under load of at least about 200Â° F. as determined in accordance with ASTM D 648, a flow of at least about 18â€³ by the spiral flow measurement of a &frac18;â€³ thick channel and a flammability rating of at least V1 as determined in accordance with Underwriters Laboratory Bulletin UL 94.