Browse Prior Art Database

Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-03

Publishing Venue

Xerox Disclosure Journal


Disclosed is an improved developer composition comprised of toner resin particles and magnetic particles, the magnetic particles being present in an amount of from about 40 percent by weight to about 70 percent by weight, said resin particles being subjected to a sulfonation reaction whereby S03H groups attach to the surface thereof, thereby resulting in toner particles having a higher conductivity and different field dependency values than unsulfonated toner particles. Such developer compositions are useful for causing the development of images in electrostatographic imaging systems, and in particular xerographic imaging sys-tems, particularly wherein the toner particles contain from about 0.004 to about 0.08 grams of sulfonic acid groups per gram of toner. The sulfonation can be accomplished in the presence of various sulfonating agents such as sulfur trioxide.