Electrophoretic development

US4123374A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Yvan Gilliams · Boortmeerbeek, BE
• Noel J. De Volder · Edegem, BE
• Walter F. De Winter · Berchem, BE
• Bernard Tavernier · Le Chambon-Feugerolles, FR

Key dates

• Filing date: Jan 19, 1977
• Grant date: Oct 31, 1978
• Expiry date: Jan 19, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/934
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A liquid developer composition suitable for use in developing electrostatic charge patterns, which composition contains in an electrically insulating carrier liquid having a volume resistivity of at least 10.sup.9 Ohm.multidot.cm and a dielectric constant below 3, a dispersed particulate coloring substance bearing one or more charge control substances and an organic polymeric material, wherein said polymeric material is a copolymer containing the following recurring units (A) and (B) or (A) and (C): ##STR1## wherein: R represents hydrogen or an alkyl group of 1 to 4 carbon atoms, PA1 R.sup.1 represents hydrogen or an acyl group, PA1 R.sup.2 represents hydrogen or carboxyl in free acid or salt form, PA1 R.sup.3 represents hydroxyl or an ether group, PA1 A represents an alkylene chain of 12 to 20 carbon atoms, PA1 Y.sup.1 represents --CO--O--CH.sub.2 --CHOH--CH.sub.2 -- PA1 Y.sup.2 represents --CO--, and PA1 x represents 4 to 20.