Process for the production of vinyl halide polymers
AssigneeTenneco Chemicals, Inc.
InventorRobert J. Stanaback
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Abstract
Vinyl halide polymers of relatively low molecular weight are obtained when a monomer component comprising a vinyl halide is polymerized in the presence of a free radical generating polymerization initiator and a molecular weight regulating agent that is a polybromobutene, such as 1,1,2,4-tetrabromobutene-2. The products have low melt viscosity and excellent fusion characteristics that make them valuable in molding, extrusion, and coating applications.
Claims7
In the process for the polymerization of a monomer component selected from the group consisting of vinyl halides and mixtures of vinyl halides with at least one ethylenically-unsaturated monomer that is copolymerizable therewith, said mixtures containing at least 70% by weight of the vinyl halide, in an aqueous medium at a temperature in the range of 40.degree. to 80.degree. C. in the presence of a free radical generating polymerization initiator, the improvement that consists of conducting the polymerization in the presence of from 0.05 percent to 2.0 percent by weight, based on the weight of the monomer component, of a polybromobutene having the formula C.sub.4 Br.sub.n H.sub.8-n, wherein n represents a number in the range of 4 to 8.
Dependencies are inferred from the claim text.