Semi-conductive steel carrier particles

Details Semi-conductive steel carrier particles Semi-conductive steel carrier particles

G - Physics

03

G

96/51

G03G 9/10 (2006.01)

Patent

CA 1103079

SEMI-CONDUCTIVE STEEL CARRIER PARTICLES ABSTRACT OF THE DISCLOSURE Magnetically-responsive electrostatographic carrier particles having semi-conductive properties are prepared by firing steel shot particles in an oxygen deficient atmosphere as to provide the carrier particles with an oxide coating. More particularly, commercially available steel shot is placed in a furnace wherein the atmosphere has an oxygen content of less than about 18 percent oxygen and the steel shot is fired at a temperature of between about 900°F and about 1600°F for a period of time of between about 10 minutes and up to about 2 hours. When employed with finely-divided toner particles to develop electrostatic latent images in a magnetic- brush development apparatus, the carriers have been found to provide developed images having lower background densities and higher resolution than prior known carrier materials.

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