Color toner and two-component developer containing same
US5149610A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1992 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Mar 4, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Four color toners of yellow, magenta, cyan and black, and four two-component developers containing the four color toners respectively in combination with a resin-coated ferrite carrier suitable for multi-color electrophotographic copying are provided. Each of the four-color toners is strictly regulated in relation not only to the carrier but also to the other color toners. More specifically, each color toner is strictly controlled with respect to a particle size distribution, freeness from agglomeration, melting characteristics including heat-absorption peaks and apparent viscosity on melting, chromaticity, triboelectric chargeability and optical toner concentration detection characteristic. Because of the strict regulation of these various parameters, the resultant multi-color toner or developer system shows excellent performances at every stage of multi-color electrophotography including development, transfer and fixing (color-mixing) for a long period of successive copying.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.