Symmetrical cyclic phosphonate compound flame retardant, including styrene resin composition

摘要

Flame-retardant styrene resin composition comprising:about 100 parts by weight of a base resin, comprising (a) a styrene resin, and (b) a polyphenylene ether resin; andabout 0,5 to about 50 parts by weight of (c) a symmetrical cyclic phosphonate compound of the following formula 1 or a mixture thereofwhere r₁ and r₂ in each case independently hydrogen, a c₁-C.₆-Alkyl group or c₆-C.₂₀-Aryl group are.