Patent ID: 8668850

Claim:
A flame retarded foamed plastic composition comprising: (A) 100 parts by weight of a polystyrene type resin; (B) 0.5-5.0 parts by weight of a brominated flame retardant having a Br content greater than 60% by weight and a 5 wt % loss temperature of 190-320° C., said brominated flame retardant possessing at least two bromine atoms attached to two adjacent aliphatic carbon atoms; (C) 0.001-0.3 parts by weight of a hindered amine of Formula 1: wherein R is H, C 1 -C 13 alkyl, or C 1 -C 10 alkoxy, n is 1, 2, 3 or 4, A is the hydrocarbon residue of a aliphatic or aromatic carboxylic acid having a valency of n; (D) 0.01-0.5 mole per 100 g of said resin of a blowing agent; (E) 0-20 parts by weight of foam nucleus agent; and (F) 0-0.3 parts by weight a phosphite ester heat stabilizer, wherein said flame retarded foamed plastic composition exhibits a passing flame retardancy in accordance with JIS A9511, and an oxygen index, LOI, of >26.0, and a decrease in weight average molecular weight (Mw) of <3% of the polystyrene type resin resulting from processing the polystyrene type resin into a foam.