Organic sulfur-containing compounds as adjuvants for positive electrostatic liquid developers

US4917985A · kind A · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Lyla M. El-Sayed · West Chester, US
• Torence J. Trout · Yorklyn, US

Key dates

• Filing date: Dec 30, 1988
• Grant date: Apr 17, 1990
• Expiry date: Dec 30, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/135
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Positive electrostatic liquid developer consisting essentially of PA1 (A) nonpolar liquid having Kauri-butanol value less than 30, present in major amount, PA1 (B) thermoplastic resin particles having an organic sulfur-containing compound which is substantially insoluble in the nonpolar liquid at ambient temperatures, as defined dispersed therein and average particle size by area being less than 10 .mu.m, and PA1 (C) nonpolar liquid soluble ionic or zwitterionic charge director compound. Optionally a colorant and charge adjuvant are present. The electrostatic liquid developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.