Toners and developers

US6850725B2 · kind B2 · utility

Assignee

• Xerox Corporation · US

Inventors

• Scott M. Silence · Rochester, US
• William H. Hollenbaugh, Jr. · Rochester, US
• Thomas R. Pickering · Webster, US
• Amy L. Stamp · Rochester, US
• Roger N. Ciccarelli · Rochester, US
• Denise R. Bayley · Fairport, US
• Samuel Kaplan · Walworth, US
• Alexander N. Klymachyov · Webster, US
• John S. Walters · Pittsford, US
• Padam K. Angra · Pittsford, US

Key dates

• Filing date: Jun 18, 2004
• Grant date: Feb 1, 2005
• Expiry date: Jun 18, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/09791
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An apparatus comprised of a charging component, a development component, a transport component, a photoconductive component, and a fusing component, and wherein the development component contains a toner comprising at least one binder in an optional amount of from about 85 to about 99 percent by weight, at least one colorant in an optional amount of from about 0.5 to about 15 percent by weight, and calcium stearate in an optional amount of from about 0.05 to about 2 percent by weight and wherein following triboelectric contact with carrier particles, the toner has a charge Q measured in femtocoulombs per particle diameter D measured in microns (Q/D) of from about −0.1 to about −1 fC/μm with a variation during development of from about 0 to about 0.25 fC/μm and wherein the distribution is substantially unimodal and possesses a peak width of from about 0.1 fC/μm to about 0.5 fC/μm and the toner possesses a charge to mass M, as measured in grams, ratio (Q/M) of from about −25 to about −70 μC/gram with variation of Q/M during development of from about 0 to about 15 μC/gram.