Phenolic antioxidants for non-polymeric halogen compounds during

Details Phenolic antioxidants for non-polymeric halogen compounds during Phenolic antioxidants for non-polymeric halogen compounds during

1977-11-07

1978-09-26

Silverberg, Sam

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

427222, 521 88, C08J 922

Patent

active

041171780

ABSTRACT:
Expandable styrene polymer particles having reduced flammability are made by incorporating from 0.1 to 15 weight per cent of non-polymeric 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 hindered phenolic antioxidants, such as di-tert-butyl-p-cresol, stabilizes the halogen compounds in the suspension system to temperatures up to 125.degree. C.

REFERENCES:
patent: 2676927 (1954-04-01), McCurdy
patent: 3801540 (1974-04-01), Dextor
patent: 3916016 (1973-10-01), Howell
patent: 4032481 (1977-06-01), Pillar

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