Polymeric powders having a predetermined and controlled size and size distribution
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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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.
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Citations
14 Claims
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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. - View Dependent Claims (2)
- m to 1 μ
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3. 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 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. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- m to 1 μ
Specification