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Composite particle dispersions

  • US 4,997,864 A
  • Filed: 01/24/1989
  • Issued: 03/05/1991
  • Est. Priority Date: 01/29/1988
  • Status: Expired due to Fees
First Claim
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1. A process for preparing a dispersion of composite particles, which process comprises mixing first particles with a liquid dispersion of polymer particles, the polymer particles being ionically and/or sterically colloidally stable against particle-particle flocculation and agglomeration, wherein the mixing takes place at a temperature above the operative glass transition temperature of the polymer particles and under a condition where ##EQU31## where γ

  • 1-3 is the interfacial energy of the first particle surface/liquid interfaceγ

    1-2 is the interfacial energy of the first particle surface/polymer particle interfaceγ

    2-3 is the interfacial energy of the polymer particle surface/liquid interfacevp and vc represent the relative volumes of, respectively, the average polymer particle and the average first particle with vp +vc =1and where the first particles are able to make contact with the surfaces of the polymer particles so that when contact occurs between first particles and polymer particles, composite particles are produced as a dispersion in the liquid phase, the composite particles having ionic and/or stearic colloidal stability against particle-particle flocculation and agglomeration.

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