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Water-in-oil polymer emulsion containing microparticles

  • US 7,531,600 B1
  • Filed: 11/12/2004
  • Issued: 05/12/2009
  • Est. Priority Date: 11/12/2003
  • Status: Expired due to Fees
First Claim
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1. A water-in-oil emulsion composition comprising:

  • (a) 5% to 99% by weight of a water-in-oil emulsion comprising;

    (i) 10% to 90% by weight of a hydrophobic oil phase;

    (ii) 0.5% to 10% by weight of a surfactant system; and

    (iii) 5% to 90% by weight of a polymer-containing aqueous phase comprising water and a polymer or copolymer containing repeat units from an acrylamide monomer, wherein the polymer or copolymer comprises from 2% by weight to 89.5% by weight of the water-in-oil emulsion;

    (b) 0.1% to 10% by weight of one or more inorganic microparticles;

    (c) 0.5% to 90% by weight of a carrier solvent; and

    (d) 0 to 90% by weight of a fluidizing agent,wherein each of the above weight percentages is based upon the total weight of the composition.

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