Mineral acids as charge adjuvants for positive liquid electrostatic developers
US5034299A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1990 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/135
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A positive charged electrostatic liquid developer consisting essentially of PA0 (A) a non-polar liquid having a Kauri-butanol value of less than 30, PA0 (B) thermoplastic resin particles, average by area particle size of less than 10 .mu.m, PA0 (C) a charge director compound, and PA0 (D) at least one inorganic acid having a solubility of at least 0.5% based on the weight of charge director compound in a mixture of (A) and (C) and represented by the formula: EQU H.sub.x Y PA0 wherein x is an integer from 1-4 and is equal to the negative charge on the anion, PA0 Y is a moiety selected from the group consisting of Cl.sup.-, F.sup.-, NO.sub.3.sup.-, NO.sub.2.sup.-, PO.sub.4.sup.-3, SO.sub.4.sup.-2, SO.sub.3.sup.-2, ClO.sub.4.sup.-, and IO.sub.4.sup.-. The liquid developer is useful in copying, color proofing, digital color proofing, making lithographic printing plates, and resists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.