Polymeric powders having a predetermined and controlled size and size distribution
AssigneeEastman Kodak Company
InventorsMridula Nair, Zona R. Pierce, Chandra Sreekumar
Life of this patent
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Abstract
Toner and/or carrier particles are prepared by dissolving a polymer in a solvent which is immiscible with water forming a suspension of small droplets of the polymer and solvent in water containing a promoter and silica particles, removing the solvent from the droplets and separating the solidified particles from the water.
Claims14
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 .mu.m to 1 .mu.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.
A method of making electrostatographic toner or carrier 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 particle size of from 0.001 .mu.m to 1 .mu.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.
Dependencies are inferred from the claim text.