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Particulate polymers, their production and uses

  • US 4,950,725 A
  • Filed: 05/19/1989
  • Issued: 08/21/1990
  • Est. Priority Date: 05/20/1988
  • Status: Expired due to Term
First Claim
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1. A particulate cross linked polymeric material formed from a water soluble ethylenically unsaturated monomer or blend of monomers comprising 10 to 100% ionic monomer and 0 to 90% non-ionic monomer and 0.005 to 3% (based on monomer) crosslinking agent and which has a dry particle size of below 20 μ

  • m, the polymeric material having a storage modulus G'"'"' of 600 to 1400 dynes/cm2, a loss modulus G" of 500 to 700 dynes/cm2 and a viscosity retention of at least 80%.

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