Electrostatographic suspension developer and a process for the production thereof

US4631243A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Wolfgang Podszun · Neunburg vorm Wald, DE
• John C. Goossens · Greenwood, US
• Carlhans Suling · Odenthal, DE
• Herman Uytterhoeven · Bonheiden, BE
• Walter F. De Winter · Berchem, BE
• Gunther Hoffarth · Leverkusen, DE
• Wolfgang Richter · Haar, DE

Key dates

• Filing date: Jul 5, 1985
• Grant date: Dec 23, 1986
• Expiry date: Jul 5, 2005

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/1355
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An electrostatographic suspension developer contains, in an electrically insulating carrier liquid with a volume resistivity of at least 10.sup.9 Ohm. cm and a dielectric constant of below 3, a dispersed pigment and a polymer of basic secondary or tertiary amino group-containing monomers, the amino groups of which are completely or partially neutralized with a Bronsted acid, which contains at least one hydrocarbon radical having from 6 to 24 carbon atoms, and optionally further comonomers.