Phenolic antioxidants for non-polymeric halogen compounds...

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

C - Chemistry, Metallurgy

08

K

403/66, 403/67,

C08K 5/13 (2006.01) C08J 9/00 (2006.01) C08J 9/18 (2006.01) C08L 25/06 (2006.01)

Patent

CA 1074050

ABSTRACT OF THE DISCLOSURE 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°C., during the impregnation step, often cause degradation of the halog compound and subsequent degradation of the polymer at the particle surface. The addition of certain hindered phenolic anti- oxidants, such as di-tert-butyl-p-cresol, stabilizes the halogen compounds in the suspension system to temperatures up to 125°c.

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