Dry color toner for electrophotography and production process thereof
US5721083A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1995 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Sep 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09783
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A color toner that is able of forming a projected image having excellent color reproducibility when a toner image is produced on an optically transparent film by electrophotography, and a color toner that is excellent in chargeability and contaminates the developing roller to a minimum extent is provided. A process for producing the toner is also provided, wherein a color toner containing at least a binder resin, a pigment and a charge controller is produced in a first step of preliminarily kneading a blend of the color toner having a haze degree of 1 through 10% and the pigment with an organic solvent at a temperature lower than the melting temperature of the binder resin followed by a second step of thermal melting and kneading with addition of the binder resin and charge controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.