Process for reducing the monomer content in expandable beads...

Details Process for reducing the monomer content in expandable beads... Process for reducing the monomer content in expandable beads...

C - Chemistry, Metallurgy

08

J

403/80

C08J 9/20 (2006.01) C08F 6/00 (2006.01) C08F 6/24 (2006.01) C08J 9/22 (2006.01)

Patent

CA 1105650

ABSTRACT OF THE INVENTION The invention relates to a process for reducing the monomer content in expandable thermoplastic beads which are produced by poylmerizing an ethylenically unsaturated monomer or a mixture of such monomers in aqueous suspension in the presence of a blowing agent. The residual monomers in both the beads and the process water are reduced by treatment of the slurry of beads and water obtained after polymerization in a vessel at a temper- ature above 65°C in the presence of at least one water soluble initiator. In order to avoid the expansion of the beads the vessel is kept completely filled with a liquid, preferably water, during the temperature treatment.

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