Impact-Modified Styrenic Polymers Containing Brominated Vinyl Aromatic-Butadiene Copolymer

摘要

Impact-modified polystyrene resins such as HIPS and ABS resins are blended with a brominated vinyl aromatic-butadiene copolymer. The brominated copolymer is an effective flame retardant in these compositions, allowing in many cases a V-1 rating to be achieved in the UL-94 vertical burn test.

主权项

1. An impact-modified styrenic polymer resin composition comprising an impact-modified styrenic polymer resin having a brominated vinyl aromatic-butadiene copolymer blended therein, wherein the brominated copolymer (a) has a molecular weight of at least 5,000, as determined by gel permeation chromatography against a polystyrene standard, (b) contains 2.5 to 85 mole-% styrenic monomer units and 15 to 97.5 mole-% butadiene units, (c) has a bromine content of at least 50% by weight of which at least 90 mole percent is bonded to butadiene units and (d) has a five percent weight loss temperature, as determined by thermogravimetric analysis, of at least 200° C.