Polymers or brominated styrene
AssigneeGreat Lakes Chemical Corporation
InventorsRay W. Atwell, Harry A. Hodgen, William R. Fielding, Nicolai A. Favstritsky, Enrico J. Termine
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Abstract
A process for the solventless polymerization of brominated styrenes includes blending monomers of brominated styrenes with a polymerization initiator, feeding the monomer/polymerization initiator mix into a prepolymerizer wherein the monomers begin to polymerize, and feeding the monomer/polymerization initiator mix and the partially polymerized bromostyrene into a screw-type extruder to drive the polymerization to a high degree of completion in a short period of time. Optionally, the monomers may be preheated before mixing with the initiator, or a heater may be included in the prepolymerizer.
Claims4
A process for the polymerization of brominated styrenes, comprising the steps of:
- (a) providing an essentially solventless blend of:
- (i) monomers of brominated styrenes;
- and
- (ii) a polymerization initiator;
- (b) feeding the monomer/polymerization initiator blend into a prepolymerizer;
- (c) reacting the monomer/polymerization initiator blend in the prepolymerizer for a time of between about 1 minute and about 5 minutes, wherein said reacting is effective to polymerize at least about 20% of the monomers of brominated styrenes;
- (d) feeding the reaction blend of step (c) into a reaction vessel;
- (e) reacting the reaction blend under conditions effective to polymerize at least about 80% of the monomers in a time between about 1 minute and about 20 minutes;
- and
- (f) removing the polymerized bromostyrene from the reaction vessel.
Dependencies are inferred from the claim text.