Toner and image forming method
US7704661B2 · kind B2 · utility
14Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2009 |
| Grant date | Apr 27, 2010 |
| Priority date | — |
| Expiry date | Sep 21, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09716
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner is provided which has toner particles and a fine silica powder mixed by external addition to the toner particles. The toner has a weight average particle diameter of 4.0 to 9.0 μm. The fine silica powder is subjected to hydrophobic treatment with dimethylsilicone oil, and has, in particle size distribution based on volume, a peak at which cumulative frequency is largest, in the measurement range of 0.02 μm to 1,000.00 μm; the cumulative frequency of 0.10 μm to less than 1.00 μm being 7.0% or less, and, the fine silica powder fulfills the following conditions:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.