Title:
キャリア芯材並びにそれを用いた電子写真用キャリア及び電子写真用現像剤
Document Type and Number:
Japanese Patent JP6757284
Kind Code:
B2
Abstract:
A carrier core material according to the present invention is a carrier core material which is represented by a composition formula MXFe3-XO4(where M is at least one type of metal element selected from a group consisting of Mg, Mn, Ca, Ti, Cu, Zn and Ni, 0 < X < 1), in which part of M and/or Fe is substituted with Sr and which is formed of ferrite particles, and in the carrier core material, a Sr content is equal to or more than 2500 ppm but equal to or less than 12000 ppm, the amount of Sr eluted with pure water at a temperature of 25°C is equal to or less than 50 ppm, an apparent density is equal to or more than 1.85 g/cm3but equal to or less than 2.25 g/cm3and magnetization σ1kwhen a magnetic field of 79.58 × 103A/m (1000 oersteds) is applied is equal to or more than 63 Am2/kg but equal to or less than 75 Am2/kg.
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Inventors:
Sho Ogawa
Application Number:
JP2017069667A
Publication Date:
September 16, 2020
Filing Date:
March 31, 2017
Export Citation:
Assignee:
dowa Electronics Co., Ltd.
dowa ip Creation Co., Ltd.
dowa ip Creation Co., Ltd.
International Classes:
G03G9/107; G03G9/113
Domestic Patent References:
| JP2015200872A | ||||
| JP2012181398A | ||||
| JP2011090120A | ||||
| JP2014189482A | ||||
| JP2015182905A | ||||
| JP2012159642A |
Attorney, Agent or Firm:
Shigeki Yamada