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AN IMPROVED DEVELOPER COMPOSITION FOR ELECTROSTATOGRAPHIC IMAGING SYSTEMS

IP.com Disclosure Number: IPCOM000023497D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 160K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an electrostatographic developer composition hav-ing finely divided electroscopic toner material and minor amounts, in relation to said toner, of a lubricious additive. The lubricious additive of this composition is the product of solvent-induced crystallization of an amorphous, crystalliz-able pOlymeric material. This lubricious additive is prepared under conditions designed to control both the rate of crystal-lization of this material and the ultimate size and distribu-tion of these crystals within the resultant product.

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AN IMPROVED DEVELOPER COMPOSI- TION FOR ELECTROSTATOGRAPHIC IMAGING SYSTEMS John M. pochan Charles L. Beatty

Proposed Classification U.S. Cl. 252/62.1 Int. Cl. G03g 9/00

Disclosed is an electrostatographic developer composition hav- ing finely divided electroscopic toner material and minor amounts, in relation to said toner, of a lubricious additive. The lubricious additive of this composition is the product of solvent-induced crystallization of an amorphous, crystalliz- able pOlymeric material. This lubricious additive is prepared under conditions designed to control both the rate of crystal- lization of this material and the ultimate size and distribu- tion of these crystals within the resultant product.

This lubricious additive can be prepared by simply contacting an amorphous, crystallizable polymer with a crystal-inducing fluid. The temperature prevailing during such contact is maintained in excess of the T of the polymer but below the T of the polymer, thereby pro~oting crystal formation on the s\IJrface of the polymer. Concurrent with such contact, the crystallizable polymer is subjected to attrition, whereby cry- stals are removed from the surface of the crystallizable poly- mer and fragmented to monodispersed particles. The rate of removal of crystalline particles from the crystallizable poly- mer is controlled so as to be approximately equivalent to or greater than the rate of crystal formation on the crystalliz- able polymer.