Method for the suspension polymerization of styrenic monomers

Details Method for the suspension polymerization of styrenic monomers Method for the suspension polymerization of styrenic monomers

C - Chemistry, Metallurgy

08

F

402/538, 402/571

C08F 2/18 (2006.01) C08F 12/06 (2006.01) C08F 212/04 (2006.01)

Patent

CA 1182249

A METHOD FOR THE SUSPENSION POLYMERIZATION OF STYRENIC MONOMERS ABSTRACT OF THE DISCLOSURE In a method for the suspension polymerization of one or more styrenic monomers, optionally with up to 35% by weight, based on the total monomers, of one or more non-styrenic vinyl monomers, a suspension of the monomer(s) is produced as droplets dispersed in a continuous water phase. The monomer(s) in the suspension is then partially polymerized by free radical initiation in the presence of at least one substantially water insoluble free radical initiator until 50% to 90% conversion is achieved. Thereafter the amount of substantially water insoluble free radical initiator(s) in the suspension is increased and the suspension polymerization is completed, again by free radical initiation. The temperature of the suspension is maintained at at least 110°C during the entire polymerization.

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