Method of depositing insoluble metal salt deposits on electrostatographic carrier surfaces

Abstract

A method of modifying the triboelectric charging propensity electrostatographic developer carrier particles, comprising the steps of: (A) providing a carrier particles that is uncoated or polymer coated; (B) mixing the carrier particles with either (i) an aqueous basic solution or (ii) an aqueous solution containing from 0.1 to 5.0 weight percent of a soluble acidic metal salt, based on the weight of the carrier particles to form a mixture; and (C) contacting the mixture with the solution, (i) or (ii), not used in step (B) thereby causing a precipitate of an insoluble salt to deposit on the carrier particles wherein the insoluble salt is (a) strontium carbonate; (b) insoluble metal hydroxides; (c) insoluble metal hydrated oxides; or (d) a mixture of two or more of (a), (b) and (c); provided that when a soluble strontium metal acid salt is used in step (B) (ii) and the carrier coating is other than a polyfluorocarbon, a reagent that provides a source of carbonate ions is also used in step (B).

Dependencies are inferred from the claim text.