Preparation of expandable styrene polymers

Details Preparation of expandable styrene polymers Preparation of expandable styrene polymers

1990-10-31

1992-03-31

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521146, C08J 916

Patent

active

051009234

ABSTRACT:
In the preparation of expandable styrene polymers by polymerizing styrene, if desired together with up to 50% by weight of other monomers, in aqueous suspension with addition of a C.sub.3 - to C.sub.6 -hydrocarbon as blowing agent and, if desired, conventional additives in effective amounts before, during or after the polymerization, foaming is reduced if the aqueous phase contains from 0.05 to 0.3% by weight of polyvinylpyrrolidone having a K value of from 100 to 150 as protective colloid.

REFERENCES:
patent: 2744291 (1956-05-01), Stastny et al.
patent: 2888410 (1959-05-01), Buchholz
patent: 3468820 (1969-09-01), Buchholz et al.
Kirk-Othmer Encyclopedia of Chemical Technology, 3rd Ed., vol. 23 (1983) pp. 967-969, 977.
Hengstenberg et al., Makromole Rulare Chemie, vol. 7 (1951) pp. 256 and 257.

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