Freeze-thaw stable, self-inverting, water-in-oil emulsion

Claim 1

A freeze-thaw stable, self-inverting, non-creaming water-in-oil emulsion containing a dispersion therein of finely-divided polymer particles, said emulsion comprising: A. an aqueous phase ranging from about 70% to about 95%, by weight, based on the total weight of A and B, which is comprised of: 1. a water-soluble acrylamide polymer containing from about 0% to about 35%, by weight of the polymer, of a copolymerizable monomer of an acrylic acid or (methacrylamidopropyl)trimethylammonium chloride, the acrylic acid in said polymer, if any, being from about 50% to about 100% neutralized, and having a concentration from about 27% to about 68%, by weight, based on the total weight of A, and 2. water in an amount ranging from about 32% to about 73%, by weight, based on the total weight of A, B. a liquid hydrocarbon oil in an amount ranging from about 5% to about 30%, by weight, based on the total weight of A and B, C. a water-in-oil emulsifying agent disposed between said aqueous phase and said liquid hydrocarbon at a concentration of about 0.1% to about 15.0%, by weight, based on the total weight of A, B and C and D. an inverting surfactant mixture comprising sodium bis(2-ethylhexyl) sulfosuccinate and a sodium bis(C 11 -C 15 alkyl) sulfosuccinate or an ethoxylated octyl or nonyl phenol, the amount of said sodium bis(2-ethylhexyl) sulfosuccinate ranging from about 0.25% to about 1.5%, by weight, when said polymer is cationic, and from about 2.8% to about 7.0%, by weight, when said polymer is anionic or non-ionic, the amount of said sodium bis(C 11 -C 15 alkyl) sulfosuccinate ranging from about 0.2% to about 0.6%, by weight, and the amount of said ethoxylated octyl or nonyl phenol ranging from about 1.5% to about 2.5%, by weight, said weight being based on the total weight of A, B, C and D.