Process for preparing fine particle expandable styrene polymers

Details Process for preparing fine particle expandable styrene polymers Process for preparing fine particle expandable styrene polymers

1979-08-29

1980-10-14

Schain, Howard E.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 60, 521 98, 521131, 521146, 521907, C08J 912, C08J 914, C08J 916, C08J 922

Patent

active

042282446

ABSTRACT:
The process for the preparation of shaped bodies based on expanded styrene polymers comprising: the polymerization of styrene or a mixture thereof with at least one monomer copolymerizable therewith, the addition of an expanding agent, pre-forming of the resulting expandable particles, ageing of the pre-formed particles, and molding thereof in a pressure resistant mold, is improved in the decrease of the minimum mold dwell time by carrying the polymerization in the presence of 0.0005 to less than 0.01% by weight based on the styrene polymer of organic bromine compounds which give a chain transfer constant of at least 200 and at 100.degree. C. in bidistilled water the bromine compounds split off less than one molar % of hydrogen bromide per equivalent of bromine present in the molecule.

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