Patent · US Expired

AB diblock copolymers as charge directors for negative electrostatic liquid developer

US5035972A · kind A · utility

21Cited by

4References

52Claims

0Family size

Assignee

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

Inventors

Lyla M. El-Sayed · West Chester, US
Loretta Ann Grezzo Page · Newark, US

Key dates

Filing date	Oct 31, 1989
Grant date	Jul 30, 1991
Priority date	—
Expiry date	Oct 31, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG03G9/133
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Negative-working electrostatic liquid developer consisting essentially of (A) nopolar liquid having Kauri-butanol value less than 30, present in major amount, (B) thermoplastic resin particles having an average particle size by area of less than 10 .mu.m, and (C) an AB diblock copolymer charge director compound as defined. Optionally a colorant and charge adjuvant are present. The process of making the electrostatic liquid developer is described. The electrostatic liquid developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.