Magnetic carrier and two-component developer
US8921023B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2013 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Aug 7, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1131
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a magnetic carrier excellent in leakage, uniformity of a solid image having satisfactory charging stability and developing performance at low electric field. The magnetic carrier is a magnetic carrier comprising: a magnetic substance-dispersed resin carrier core, which contains a magnetic substance and a binding resin, and a coating resin on a surface thereof, wherein: the carrier core has resistivity at 1000 V/cm of 5.0×106-8.0×107 Ω·cm, the magnetic substance has a number average particle diameter of 0.20-0.35 μm; and comprises magnetic-substance particles having vertexes and a particle diameter of 0.53 μm or more in an amount of 10.0-32.0 vol % based on a total amount of the magnetic substance; and wherein: the carrier core has Fe2O3 content of 98.00% by mass or more; and ZnO content of 0.06-0.50% by mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.