Method of depositing insoluble metal salt deposits on electrostatographic carrier surfaces
US5705221A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1996 |
| Grant date | Jan 6, 1998 |
| Priority date | — |
| Expiry date | Apr 10, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1139
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of modifying the triboelectric charging propensity electrostatographic developer carrier particles, comprising the steps of: PA1 (A) providing a carrier particles that is uncoated or polymer coated; PA1 (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 PA1 (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 PA2 (a) strontium carbonate; PA2 (b) insoluble metal hydroxides; PA2 (c) insoluble metal hydrated oxides; or PA2 (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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.