Degradable resins for electrostatic liquid developers
US5208131A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 1992 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Jan 10, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Electrostatic liquid developer consisting essentially of PA1 (A) nonpolar liquid having Kauri-butanol value less than 30, present in major amount, PA1 (B) particles, average by area particle size of less than 10 .mu.m, of a degradable polymeric resin as defined, and PA1 (C) nonpolar liquid soluble ionic or zwitterionic charge director compound. Optionally a colorant and an adjuvant compound are present. Process of preparation of electrostatic liquid developers is described. The developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists. The developer particles can be readily removed from the printed material, such as paper, by degradation of the polymer. If the polymeric resin is depolymerized, the monomer and low molecular weight units can be recycled by being repolymerized, or discarded in a landfill as a biodegradable environmentally benign by-product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.