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US 6,551,754 B2Granted
Method for coating carrier particles
AssigneeXeikon NV
InventorDaniel Heitzmann
Life of this patent
Estimating the term…
Abstract
A method for coating carrier particles wherein the carrier particles are stirred mechanically and wherein the volume of the coating solution is in the same order of magnitude as the volume of the carrier particles to be coated.
Claims13
A method for coating carrier particles having a volume average diameter between 20 and 200 μm, for use in electrostatic developers, comprising the steps of:
- forming a coating mixture in a vessel at a temperature from 15 to 40 degrees C. by adding a coating solution comprising a volume B of B ml of at least one solvent, the solvent having a boiling point, to carrier particles having a volume A of A ml in said vessel, said volume A and said volume B being selected such that 0.5≦A/B≦5, wherein said coating solution comprises a solvent having a lowest boiling point of all solvents present in the coating solution;
- and
- evaporating said at least one said solvent by mechanically agitating and gradually heating said coating mixture to a temperature of at most 10 degrees C. above the lowest boiling point.
A method for coating carrier particles having a volume average diameter between 20 and 200 μm, for use in electrostatic developers, comprising the steps of:
- forming a coating mixture in a vessel at a temperature from 15 to 40 degrees C. by adding a coating solution comprising a volume B of B ml of at least one solvent, the solvent having a boiling point, to carrier particles having a volume A of A ml in said vessel, said volume A and said volume B being selected such that 0.5≦A/B≦5, wherein said coating solution comprises a solvent having a lowest boiling point of all solvents present in the coating solution;
- and
- evaporating said at least one said solvent by mechanically agitating and gradually heating said coating mixture at an average rate from 0.5 degrees C. to 3 degrees C. per minute to a temperature of at most 10 degrees C. above the lowest boiling point.
Dependencies are inferred from the claim text.