Magnetic toner and image forming method
US6653036B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1998 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Sep 16, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0837
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic toner includes a magnetic toner particle containing a binding resin and a magnetic material. The magnetic material includes a magnetic iron oxide containing 0.10% to 4.00% by weight of an element &agr; belonging to the third period to the seventh period with an atomic number of 11 to 103 and having an electronegativity of 1.0 to 2.5. The solubility S1 of &agr; in the magnetic material at an iron solubility of 0% to 20% is from 10% to less than 44% and the solubility S2 of &agr; at an iron solubility of 80% to 100% is from 5% to less than 30%. The magnetic material contains at least 60% by number of multinuclear magnetic iron oxide particles or at least 60% by number of polyhedral magnetic iron oxide particles having faces at ridgeline portions of hexahedron and/or octahedron multinuclear magnetic iron oxide particles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.