Processes for liquid developer compositions with high transfer efficiencies
US4789616A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Nov 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A process for the preparation of liquid developer compositions containing dyed polymer particles with an average diameter of from about 2 to about 6 microns, which particles are dispersed in an oil base, charge control additives, and stabilizers thereby permitting image transfer efficiencies exceeding 80 percent, which comprises formulating polymer particles by dispersion polymerization in a mixture comprised of a first oil base solvent, and a second solvent with a higher volatility than said first solvent, and further containing an amphipathic steric stabilizer; thereafter dyeing the product resulting; followed by removal of the more volatile second solvent; and subsequently adding to the dyed product a charge control additive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.