Preparation of styrene suspension polymers

Details Preparation of styrene suspension polymers Preparation of styrene suspension polymers

1982-06-04

1984-02-21

Michl, Paul R.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

526233, 526346, 525244, C08F 218

Patent

active

044331088

ABSTRACT:
A process for the preparation of styrene homopolymers or copolymers by suspension polymerization of monomers which contain dissolved styrene polymers from a preceding suspension polymerization, in the presence of sparingly soluble metal phosphates as suspension stabilizers, wherein, before the polymerization is started, the monomer phase is dispersed in an aqueous phase, containing a dissolved mineral acid, preferably phosphoric acid, at from 10.degree. to 80.degree. C. for from 5 to 120 minutes, after which the sparingly soluble metal phosphate is formed in situ in the aqueous phase. The process is particularly suitable for the preparation of expandable styrene polymers, in which case a volatile blowing agent is added to the suspension before, during or after polymerization.

REFERENCES:
patent: 2524627 (1950-10-01), Hohenstein
patent: 2673194 (1954-03-01), Grim
patent: 3068192 (1962-12-01), White
patent: 3819597 (1974-06-01), Richards
patent: 3919355 (1975-11-01), Ballova et al.
patent: 4129706 (1978-12-01), Keppler et al.
patent: 4241191 (1980-12-01), Keppler et al.

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