C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/9038
C08F 2/32 (2006.01) C08L 57/00 (2006.01)
Patent
CA 1209735
ABSTRACT OF THE DISCLOSURE This invention is directed to water-in-oil emulsions of water-soluble polymers and to a process for making such emulsions. The emulsion comprises (1) a discontinuous aqueous phase containing a water- -soluble polymer which aqueous phase is dispersed as colloidal size particles or droplets in (2) a continuous oil phase wherein the emulsion contains an emulsion stabilizing amount of a water-soluble salt and an emulsifying amount of a water-in-oil emulsifier, said salt added prior to polymerization to form the water- -soluble cationic polymer. The water-in-oil emulsions are characterized in that the water-soluble polymer is a cationic polymer and the water-soluble salt is a salt of a monovalent anion. The process for preparing the water-in-oil emulsions comprises (1) forming a stable water-in-oil emulsion (monomeric precursor) containing at least one water-soluble monomer in the aqueous phase which is dispersed in a continuous oil phase, said emulsion containing a stabilizing amount of a water-soluble salt and an emulsifying amount of a water-in-oil emulsifier, and (2) subjecting the monomeric precursor to conditions sufficient to polymerize the monomer. The method is characterized in that at least one water-soluble monomer is a cationic monomer and the water-soluble salt is a salt of a monovalent anion. The water-in-oil emulsions of this invention are employed to supply flocculant to many substrates including, for example, sewage, cellulosic fibers and fines for retention and freeness; metal or treatment plating wastes, and coal tailings.
436972
Smart & Biggar
The Dow Chemical Company
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