Browse Prior Art Database

DEVELOPER COMPOSITION CONTAINING IMPROVED CARRIER

IP.com Disclosure Number: IPCOM000024251D
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 57K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a developer composition comprising finely divided toner particles and granular crystalline carrier having a particle size in excess of the toner. The carrier is prepared by a) contacting an amorphous crystallizable polymer with a crystal-inducing fluid, the temperature prevailing during such contact being in excess of the glass transition temperature of the amorphous polymer (Le., the temperature at which at least some of the amorphous polymer undergoes a transition from a glassy to a rubbery phase) but below the melting point temperature of the polymer (Le., the temperature at which the step change increase in volume of the crystalline phase of the polymer occurs), thereby promoting crystal formation on the surface of the polymer and b) subjecting the crystallizable polymer to attrition concurrent with the contacting step. Crystals are thereby removed from the surface of the polymer and fragmented to monodispersed particles, the rate of removal of crystalline particles from the surface of the polymer being approximately equivalent to or greater than the rate of crystal formation on said crystallizable polymer.

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KEROX DISCLOSURE JOURNAL

DEVELOPER COMPOSITION CONTAINING Proposed Classification IMPROVED CARRIER U.S. CI. 252/62.1
Charles L. Beatty
Int. John M.Pochan C1. G03g 9/00

Disclosed is a developer composition comprising finely divided toner particles and granular crystalline carrier having a particle size in excess of the toner. The carrier is prepared by a) contacting an amorphous crystallizable polymer with a crystal-inducing fluid, the temperature prevailing during such contact being in excess of the glass transition temperature of the amorphous polymer (Le., the temperature at which at least some of the amorphous polymer undergoes a transition from a glassy to a rubbery phase) but below the melting point temperature of the polymer (Le., the temperature at which the step change increase in volume of the crystalline phase of the polymer occurs), thereby promoting crystal formation on the surface of the polymer and b) subjecting the crystallizable polymer to attrition concurrent with the contacting step. Crystals are thereby removed from the surface of the polymer and fragmented to monodispersed particles, the rate of removal of crystalline particles from the surface of the polymer being approximately equivalent to or greater than the rate of crystal formation on said crystallizable polymer.

Volume 5 Number 1 January/February 1980 45

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46

XEtlC-Y I)ISCLOSURE JOURNAL

Volume 5 Numbel .' January/February...