Browse Prior Art Database

ELECTROPHOTOGRAPHIC DEVELOPER USING MAGNETIC TONER

IP.com Disclosure Number: IPCOM000023912D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 232K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a developer using magnetic toner and more specifically, a two com-ponent, magnetic brush development system wherein a magnetic toner carrier binding force is obtained by dispersing a magnetic material in the toner resin as a replacement for some of the polymer used in the resin. One advantage of accomplishing this dispersion is that the resulting toner when used in an electro-photographic system will cause supression of background toner deposition because of the nondegrading, magnetic toner carrier attraction force. In one embodiment, a mixture of a partially coated steel grit and magnetic toner containing 50 percent by weight of finely divided magnetite was used in a manual-imagingprocess apparatus; and images of high density with virtually no background deposits were produced with a single magnetic brush roller. This indicates that the conductive magnetic toner developer will allow the development of high quality images at a high development rate with a very large image-to-backgrounddensity ratio.

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ELECTROPHOTOGRAPHIC DEVELOPER Proposed Classification ________________________ U.S. Cl. 252/62.1
A. CI. Liebman mt. Cl. G03g 9/00

Disclosed is a developer using magnetic toner and more specifically, a two com~ ponent, magnetic brush development system wherein a magnetic toner carrier binding force is obtained by dispersing a magnetic material in the toner resin as a replacement for some of the polymer used in the resin. One advantage of accomplishing this dispersion is that the resulting toner when used in an electro~ photographic system will cause supression of background toner deposition because of the nondegrading, magnetic toner carrier attraction force. In one embodiment,
a mixture of a partially coated steel grit and magnetic toner containing 50 percent by weight of finely divided magnetite was used in a manual~imagingprocess apparatus; and images of high density with virtually no background deposits were produced with a single magnetic brush roller. This indicates that the conductive magnetic toner developer will allow the development of high quality images at a high development rate with a very large image~to~backgrounddensity ratio.

Volume 4 Number 2 March/April 1979

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