Preparation of bead-form expandable styrene polymers

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

1993-06-17

1994-03-01

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 57, 521 60, 521146, C08J 920

Patent

active

052908194

ABSTRACT:
Bead-form expandable styrene polymers are obtained by suspension polymerization of styrene with addition of from 1 to 10% by weight of C.sub.3 - to C.sub.7 -hydrocarbons and/or carbon dioxide as blowing agent and, if desired, conventional additives, using, as suspension stabilizer, a mixture of magnesium pyrophosphate, a sulfonate group-containing extender and an alkali metal carboxylate or alkaline earth metal carboxylate, 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.

REFERENCES:
patent: 3755282 (1973-08-01), Wright
patent: 4085169 (1978-04-01), Saito et al.
patent: 4173688 (1979-11-01), Saito et al.
patent: 5132330 (1992-07-01), Ueda et al.

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