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

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.