Quaternary ammonium compound as charge adjuvants for positive electrostatic liquid developers
US5382492A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Nov 29, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1355
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A positive-working electrostatic liquid developer consisting essentially of (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount;(B) thermoplastic resin particles having dispersed therein a quaternary ammonium compound which is substantially insoluble in the nonpolar liquid and is represented by the general formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be the same or different and are hydrogen, alkyl of 1 to 40 carbon atoms, aryl of 6 to 30 carbon atoms, and any of the group R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be joined to form a 5 or 6 membered ring, and A.sup.- is an anion; and (C) a nonpolar liquid soluble ionic or zwitterionic charge director compound. The process of preparation of the electrostatic liquid developer is described. The liquid developers are useful in copying, color proofing including digital color proofing, lithographic printing plates and resists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.