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Browse Prior Art Database

BLACK PEARLS L* CARBON BLACK IN XEROGRAPHIC TONERS

IP.com Disclosure Number: IPCOM000026379D
Original Publication Date: 1991-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 62K

Publishing Venue

Xerox Disclosure Journal

Abstract

A toner composition containing Black Pearls L@ carbon black for use in electrophotographic printing and copying machines is disclosed. The composition is comprised of a styrene-butadiene copolymer resin, pigment particles, a quaternary ammonium salt charge control additive, and optionally magnetic particles, lubricants, flow additives, and the like, as disclosed, for example, in Xerox U.S. Patents 4,937,157 and 4,904,762.

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XEROX DISCLOSURE JOURNAL

BLACK PEARLS L@ CARBON Proposed Classification BLACK IN XEROGRAPHIC TONERS
Timothy L. Lincoln
Edward J. Gutman

U.S. C1.430/110 Int. C1. G03g 09/08

A toner composition containing Black Pearls L@ carbon black for use in electrophotographic printing and copying machines is disclosed. The composition is comprised of a styrene-butadiene copolymer resin, pigment particles, a quaternary ammonium salt charge control additive, and optionally magnetic particles, lubricants, flow additives, and the like, as disclosed, for example, in Xerox U.S. Patents 4,937,157 and 4,904,762.

When the pigment particles are Black Pearls L@ carbon black available from Cabot Corporation. the composition exhibits superior toner admix properties and print quality after shelf aging or simulated heat aging as compared to other comparable commercially available carbon black pigments, for example, Regal 330@ carbon black available from Cabot Corporation . It is believed that the surface properties and surface chemistries of the Black Pearls L@ are responsible for the unexpected improvement in toner shelf life and aging properties. The Black Pearls L@ containing toner compositions are particularly useful in mid and high volume printing and copying applications that may employ substantial toner inventories stored under highly variable ambient conditions over many months.

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 4 July/August 1991 267

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