Preparation of bead-form expandable styrene polymers

Details Preparation of bead-form expandable styrene polymers Preparation of bead-form expandable styrene polymers

C - Chemistry, Metallurgy

08

J

C08J 9/20 (2006.01) C08L 25/04 (2006.01)

Patent

CA 2097009

Abstract of the Disclosure: Bead-form expandable styrene polymers are obtained by suspension polymerization of styrene with addition of from 1 to 10% by weight of C3- to C7-hydrocarbons and/or carbon dioxide as blowing agent and, if desired, conventional additives, using, as suspension stabilizer, a mixture of magnesium pyro- phosphate, a sulfonate group-containing extender and an alkali metal carboxylate or alkaline earth metal carboxy- late, the magnesium pyrophosphate being prepared immediately before the polymerization by combining an aqueous solution of alkali metal pyrophosphate with at least the stoichiometrically necessary amount of a magnesium salt.

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