Black magnetic iron oxide particles, magnetic carrier for electrophotographic developer and two-component developer
US9285698B2 · kind B2 · utility
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3References
11Claims
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Key dates
| Filing date | Jun 15, 2009 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Sep 15, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1136
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Black magnetic iron oxide particles having an average particle diameter of 0.05 to 2.0 μm and an electric resistance value at an applied voltage of 100 V of not less than 1×108 Ω·cm. Also a magnetic carrier for electrophotographic developer having spherical magnetic composite particles obtained by dispersing black magnetic iron oxide particles in a binder resin. The magnetic carrier has an electric resistance value R100 at an applied voltage of 100 V of 1×108 to 1×1014 Ω·cm, and an electric resistance value R300 at an applied voltage of 300 V which satisfies the relationship represented by the formula:0.1≦R300/R100≦1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.