Title:
FERRITE PARTICLE, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, ELECTROPHOTOGRAPHIC DEVELOPER, AND METHOD FOR PRODUCING FERRITE PARTICLE
Document Type and Number:
WIPO Patent Application WO/2022/250150
Kind Code:
A1
Abstract:
The present invention provides a ferrite particle comprising: a ferrite particle main body that has a spinel-type crystal structure attributed to a space group Fd-3m, in which the spinel composition is represented by the specific formula (1); and a coating layer that has a spinel-type crystal structure attributed to a space group Fd-3m and coats the surface of the ferrite particle main body. In the ferrite particle, the coating layer is a layer produced by heat-treating a ferrite represented by the specific formula (1), the content ratio of the coating layer in the ferrite particle is 5 to 35% by mass inclusive when determined by the Rietveld analysis of a powder X-ray diffraction pattern, and the ferrite particle satisfies the specific formula (2).
The present invention also provides: a carrier for an electrophotographic developer; and others.
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Inventors:
YAMASAKI YUZURU (JP)
ISHIKAWA MAKOTO (JP)
UEMURA TETSUYA (JP)
ISHIKAWA MAKOTO (JP)
UEMURA TETSUYA (JP)
Application Number:
PCT/JP2022/021792
Publication Date:
December 01, 2022
Filing Date:
May 27, 2022
Export Citation:
Assignee:
POWDERTECH CO LTD (JP)
International Classes:
C01G49/00; G03G9/107; G03G9/113
Domestic Patent References:
| WO2016143646A1 | 2016-09-15 |
Foreign References:
| JP2017097252A | 2017-06-01 | |||
| JP2013178414A | 2013-09-09 | |||
| JP2018163196A | 2018-10-18 | |||
| JP2013178414A | 2013-09-09 | |||
| JP2017021195A | 2017-01-26 | |||
| JP2021089756A | 2021-06-10 |
Other References:
"AtomWork", NATIONAL RESEARCH AND DEVELOPMENT AGENCY
Attorney, Agent or Firm:
KOH-EI PATENT FIRM, P.C. (JP)
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