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Title:
FERRITE PARTICLES, ELECTROPHOTOGRAPHIC DEVELOPER CARRIER CORE MATERIAL, ELECTROPHOTOGRAPHIC DEVELOPER CARRIER, AND ELECTROPHOTOGRAPHIC DEVELOPER
Document Type and Number:
WIPO Patent Application WO/2021/200171
Kind Code:
A1
Abstract:
Provided are: ferrite particles in which the environmental stability of charging characteristics is high and the charge rise is good; an electrophotographic developer carrier core material; an electrophotographic developer carrier; and an electrophotographic developer. The ferrite particles are characterized by containing a crystal-phase component comprising perovskite crystals represented by the composition formula of RZrO3 (wherein R is an alkaline earth metal element), and by having a surface roughness Rz of 0.8 μm to 3.5 μm, inclusive, and further characterized in that the standard deviation Rzσ of the surface roughness is within a range represented by a prescribed formula. The ferrite particles are used as an electrophotographic developer carrier core material. Using the same, an electrophotographic developer carrier and an electrophotographic developer are obtained.

Inventors:
ISHIKAWA MAKOTO (JP)
UEMURA TETSUYA (JP)
Application Number:
PCT/JP2021/010912
Publication Date:
October 07, 2021
Filing Date:
March 17, 2021
Export Citation:
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Assignee:
POWDERTECH CO LTD (JP)
International Classes:
G03G9/107; G03G9/113
Domestic Patent References:
WO2020175326A12020-09-03
WO2020175336A12020-09-03
Foreign References:
JP2011118380A2011-06-16
JP2019159124A2019-09-19
JP2006017828A2006-01-19
JPH01291406A1989-11-24
JP2016106262A2016-06-16
JP5886336B22016-03-16
Other References:
See also references of EP 4130885A4
Attorney, Agent or Firm:
KAMIMURA, Yoshihiro (JP)
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