Electrographic fluorescent liquid developer
US5330868A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1992 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Sep 8, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/125
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrographic liquid developer includes a fluorescent toner diluted in a liquid developer vehicle which has a high flash point and a low vapor pressure. The liquid developer vehicle preferably is a mixed liquid alkane which has a flash point over 140.degree. F. and a vapor pressure less than 5.2 mm of mercury at 38.degree. C. The fluorescent toner is preferably made as follows: a solution is prepared which comprises an organic solvent, a fluorescent dye, and an organic polymer. A pigment is precipitated by mixing the solution with a non-solvent for the polymer in the presence of a dispersant. The pigment is melt-compounded with a polymeric organic binder and the melt-compounded mixture is comminuted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.