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Polymeric powders having a predetermined and controlled size and size distribution

  • US 4,833,060 A
  • Filed: 03/21/1988
  • Issued: 05/23/1989
  • Est. Priority Date: 03/21/1988
  • Status: Expired due to Term
First Claim
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1. A method of making polymeric particles having a predetermined and controlled size and size distribution which comprises dissolving a polymer in a solvent therefor to form a solution said solvent being immiscible with water, forming a suspension of small droplets of said solution in water containing a promoter and silica particles having an average prticle size of from 0.001 μ

  • m to 1 μ

    m by high shear agitation, said promoter being a water soluble compound that affects the hydrophilic/hydrophobic balance of the silica particles in the water suspension, removing the solvent from the droplets and separating the solidified polymer particles from the water.

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