Developer for replenishment and image forming method
US8142972B2 · kind B2 · utility
52Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2006 |
| Grant date | Mar 27, 2012 |
| Priority date | — |
| Expiry date | Apr 7, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a developer for replenishment capable of forming a high-quality image even upon duration. The developer for replenishment includes at least a toner and a magnetic carrier, and in the developer for replenishment, 1 part by mass of the magnetic carrier is blended with 2 to 50 parts by mass of the toner, and the magnetic carrier contains a ferrite core and a resin component, has a true specific gravity of 2.5 to 4.2 g/cm3, has a 50% particle diameter on a volume basis (D50) of 15 to 70 μm, and has an average circularity of 0.850 to 0.950, the average circularity having a coefficient of variation of 1.0 to 10.0%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.