Magenta toner and imaging processes

US5561013A · kind A · utility

Assignee

• Xerox Corporation · US

Inventors

• Katherine N. O'Brien · Pittsford, US
• Janet L. Castano · Penfield, US
• Donald Riley · Rochester, US
• Charles D. Zimmer · Ontario, US
• Mark Ballou · Otley, US
• Jane M. Kanehl · New York, US
• Sandra J. Hutkowski · Penfield, US
• Patricia J. Donaldson · Pittsford, US
• Raymond L. Sommers · Webster, US

Key dates

• Filing date: Sep 15, 1995
• Grant date: Oct 1, 1996
• Expiry date: Sep 15, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/09741
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An imaging process which comprises (1) charging an imaging member in an imaging apparatus; (2) creating on the member a latent image comprising areas of high, intermediate, and low potential; (3) developing the low areas of potential with a first developer comprising carrier particles and a first negatively charged toner comprised of resin, the magenta pigment 2,9-dimethyl quinacridone, a charge additive, or a mixture of charge additives, and surface additives; (4) developing the high areas of potential with a second developer comprising carrier particles and a second black toner comprised of resin, pigment, and a charge enhancing additive that enables a positively charged toner; (5) transferring the resulting developed image to a substrate; and (6) fixing the image thereto.