Toners for electrostatic-image development, cartridge employing toner for electrostatic-image development, and image-forming apparatus
US8871413B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2008 |
| Grant date | Oct 28, 2014 |
| Priority date | — |
| Expiry date | Jun 5, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2221/0005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An object of the invention is to provide a toner which is effective in improving image quality while inhibiting white-background fouling, residual-image phenomenon (ghost), blurring (suitability for solid printing), and the like that occur depending on the proportion of a fine powder having a particle diameter not larger than a specific value, and which has satisfactory removability in cleaning, mitigates problems concerning fouling, etc. in long-term use even on a high-speed printer, and attains excellent image stability. Another object is to provide an image-forming apparatus and a toner cartridge each employing the toner. The invention provides a toner for electrostatic-image development satisfying all of the following (1) to (4) or a toner for electrostatic-image development which is a toner containing a charge control agent and satisfying all of the following (5) to (7). The invention further provides an image-forming apparatus and a toner cartridge each employing the toner.(1) To have a volume-median diameter (Dv50) of from 4.0 μm to 7.5 μm.(2) To have an average degree of circularity of 0.93 or higher.(3) A volume-median diameter (Dv50) of the toner and population number % o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.