Xerox Corporation

Jeffrey L DeBarr

Scott M Silence

Joo T Chung

Edward J Gutman

James M Proper

Judith M Vandewinckel

James G Stenzel

Brian E Moore

Brian S Giannetto

Charles G Dickerson

Morris M DeYoung, Jr

Frank O Reitze

A toner of toner particles containing at least one binder, at least one color ant, and an external additive package comprised of zinc stearate and at. least one of silicon dioxide or titanium dioxide, wherein the amount of zinc stearate is limited to about 0.10 percent by weight or less of the toner. It has been surprisingly found that when the amount of zinc stearate is so limited, a developer formed from the toner exhibits excellent triboelectric charging and stability and excellent developer flow. When the developer is used in a magnetic brush development system, consistent, high quality copy images are formed substantially without any depletion defects over time.

Toner and developer for magnetic brush development system

A process for the preparation of colored toners which comprises mixing a first toner comprised of resin, pigment particles, charge additive, and surface additives, with a second toner comprised of resin, pigment particles, and charge additive, and wherein the resulting colored toners contain from about 0.05 to about 0.5 weight percent of surface additives.

Toner processes with surface additives

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Williamson, NY, United States of America

Jeffrey L DeBarr