Carrier core material, coated carrier, and two-component developing agent for electrophotography
US7553597B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2004 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Jan 20, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A carrier core material containing at least one metal oxide (MLO) having a melting point of not higher than 1000° C. and at least one metal oxide (MHO) having a melting point of not lower than 1800° C., wherein the metal (MH) for constituting the metal oxide (MHO) has an electrical resistivity of not less than 10−5 Ω·cm. Also disclosed is a two-component developing agent comprising a coated carrier, which comprises the carrier core material coated with a resin, and toner particles. Further disclosed is an image forming method comprising developing an electrostatic latent image formed on a photosensitive member with the two-component developing agent using an alternating electric field. The carrier core material and the coated carrier have high magnetization and are free from occurrence of leakage of electric charge over a wide range of electric field from low electric field to high electric field. According to the two-component developing agent, an excellent image can be formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.