Toner, method for forming image using the toner, and process cartridge
US7141343B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2003 |
| Grant date | Nov 28, 2006 |
| Priority date | — |
| Expiry date | Feb 14, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0241
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner exhibits excellent image characteristics, and also has an excellent charging property even if the toner is used in a cleaning-simultaneous-with-developing system having a direct injection charging mechanism. The toner includes toner particles and non-magnetic metallic-compound fine particles. The weight average particle diameter of the toner is 3.0 μm to 12.0 μm. The metallic-compound fine particles are conductive metallic-compound fine particles having a specific surface area (cm2/cm3) of 5×105 to 100×105; a medium diameter (D50) of 0.4 μm to 4.0 μm with respect to a volume-based particle diameter distribution, the medium diameter (D50) being smaller than the weight average particle diameter of the toner; and a 90% particle diameter D90 of 6.0 μm or less with respect to a volume-based particle diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.