Process for the production of expandable styrene polymers in...

Details Process for the production of expandable styrene polymers in... Process for the production of expandable styrene polymers in...

C - Chemistry, Metallurgy

08

J

C08J 9/16 (2006.01) C08J 9/20 (2006.01)

Patent

CA 2098240

ABSTRACT PROCESS FOR THE PRODUCTION OF EXPANDABLE STYRENE POLYMERS IN BEAD FORM A process for manufacturing expandable beads of styrene polymers is disclosed. The process comprises two steps of polymerization, carried out at different temperatures and in the presence of different initiators. The process according to the invention uses as initiator an aliphatic or cycloaliphatic perketal or monoperoxycarbonate in the second step of polymeriza- tion. The polymers so produced have very low concentrations of benzene and a substantially lower monomer content compared with conventional products. The polymers may be foamed to provide foam particles.

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