SETT ATT GORA STYRENPOLYMERPARTIKLAR MINDRE ANTENDBARA GENOM BEHANDLING MED EN ORGANISK HALOGENFORENING I NERVARO AV ETT TERMISKT STABILISERINGSSYSTEM SAMT MOTSVARANDE STYRENPOLYMERKOMPOSITION

摘要

HEAT STABILIZERS FOR EXPANDABLE STYRENE POLYMERS Expandable styrene polymer particles having reduced flammability are made by incorporating from 0.1 to 15 weight per cent of organic halogen compounds into the polymer during impregnation of the polymer particles with a blowing agent in aqueous suspension. Temperatures greater than 90.degree.C., during the impregnation step, often cause degradation of the halogen compound and subsequent degradation of the polymer at the particle surface. The addition of certain thermal stabilizers, such as a mixture of a modified epoxidized soybean oil and a barium/ cadmium organic complex, stabilizes the halogen compounds in the suspension system to temperatures up to 115.degree.C. 1.