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Title:
CARRIER CORE MATERIAL, AND CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPMENT AND ELECTROPHOTOGRAPHIC DEVELOPER EMPLOYING SAME
Document Type and Number:
WIPO Patent Application WO/2022/244573
Kind Code:
A1
Abstract:
A carrier core material according to the present invention comprises ferrite particles, contains CaSiO3, and has a true density at least equal to 3.5 g/cm3 and at most equal to 4.5 g/cm3. A particle strength index calculated from formula (1) is preferably at most equal to 1.5% by volume. (1): Particle strength index = V2-V1 (In the formula, V1: cumulative value (% by volume) of particle size 22 μm or less in cumulative particle size distribution of carrier core material before crushing test, and V2: cumulative value (% by volume) of particle size 22 μm or less in cumulative particle size distribution of carrier core material after crushing test) Crushing test conditions: 30 g of carrier core material crushed using a sample mill for 60 seconds at a rotational speed of 14000 rpm

Inventors:
SASAKI SHINYA (JP)
Application Number:
PCT/JP2022/018107
Publication Date:
November 24, 2022
Filing Date:
April 19, 2022
Export Citation:
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Assignee:
DOWA ELECTRONICS MATERIALS CO (JP)
DOWA IP CREATION CO LTD (JP)
International Classes:
G03G9/107
Domestic Patent References:
WO2014033875A12014-03-06
Foreign References:
JP2016170224A2016-09-23
JP2009086093A2009-04-23
Attorney, Agent or Firm:
YAMADA, Shigeki (JP)
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