Inverse emulsion polymerization with sorbitan fatty acid esters and ethoxylated alcohol

  • US 4,764,574 A
  • Filed: 12/09/1986
  • Issued: 08/16/1988
  • Est. Priority Date: 12/09/1986
  • Status: Expired due to Fees
First Claim
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1. A water-in-oil emulsion polymerization process for making a water-soluble polymer from a monomer system comprising at least one of an N-vinyl lactam and a vinyl-containing sulfonate or the corresponding acid, comprising:

  • combining an aqueous component, a hydrocarbon component, said monomer system, an initiator, and a surfactant system, wherein said surfactant system comprises(1) a first surfactant composition consisting essentially of a blend of a sorbitan fatty acid ester and a polyethoxylated sorbitan fatty acid ester, said first surfactant composition having an HLB within the range of about 7 to about 9;

    (2) a second surfactant composition consisting essentially of an ethoxylated alcohol of the formula
    
    
    space="preserve" listing-type="equation">R.sup.2 (OCH.sub.2 CH.sub.2).sub.4 OHwhere R2 is a straight chain hydrocarbon group having 16 to 18 carbon atoms, said second surfactant composition having an HLB within the range of about 7 to about 9;

    agitating the resulting inverse emulsion and maintaining said inverse emulsion under polymerization conditions for a time sufficient to form said polymer.

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