Magnetic core material for electrophotographic developer, carrier for electrophotographic developer, and developer
US10969706B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Jan 15, 2018 |
| Grant date | Apr 6, 2021 |
| Priority date | — |
| Expiry date | Jan 15, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided are a magnetic core material for electrophotographic developer and a carrier for electrophotographic developer, which are excellent in charging characteristics and strength with low specific gravity and with which a satisfactory image free of defects can be obtained, and a developer containing the carrier.A magnetic core material for electrophotographic developer, having a sulfur component content of from 60 to 800 ppm in terms of a sulfate ion and a pore volume of from 30 to 100 mm3/g.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.