Dispersion polymerization process

Details Dispersion polymerization process Dispersion polymerization process

C - Chemistry, Metallurgy

08

F

C08F 2/26 (2006.01) C08F 2/10 (2006.01) C08F 291/00 (2006.01)

Patent

CA 2125084

Abstract of the Invention A polymerization process prepares a water-soluble polymer in the form of a water-continuous dispersion. In this process the peak in-production viscosity developed in the aqueous reaction mixture is lower than the peak in-production viscosity developed in an equivalent batch polymerization. The process comprises: polymerizing a water-soluble monomer in an aqueous reaction mixture, wherein the aqueous reaction mixture contains polyvalent anionic salt, at least one polymeric dispersant, optionally a low molecular weight polyhydric organic alcohol and optionally a preformed polymer seed, wherein the water soluble monomer, the polyvalent anionic salt, the polymeric dispersant and the polyhydric organic alcohol, if any, are solutes of the aqueous reaction mixture, and the preformed polymer seed, if any, is insoluble in the aqueous reaction mixture, wherein the water-soluble polymer formed during the polymerization is insoluble in the aqueous reaction mixture at the concentration thereof formed during the polymerization, and wherein a portion of the monomer is fed to the aqueous reaction mixture after the polymerization reaction has been initiated.

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