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Title:
FERRITE PARTICLES, ELECTROPHOTOGRAPHY CARRIER USING SAME, AND ELECTROPHOTOGRAPHY DEVELOPER
Document Type and Number:
WIPO Patent Application WO/2012/128236
Kind Code:
A1
Abstract:
Provided are ferrite particles containing a material represented by the compositional formula MXFe3-XO4 (wherein M denotes at least one among Mg and Mn, and 0 ≤ X ≤ 1) as a primary component, and containing at least one of elemental Sr and elemental Ca at a total content of 0.1 wt.% to 2.5 wt.%. When the ferrite particles are used as a carrier, the flow rate following magnetization in a magnetic field having a magnetic field strength of 1000/(4π) kA/m (1000 oersted) is preferably 40 seconds or more in order to obtain higher image density. In addition, the residual magnetization (σr) is preferably 3 Am2/kg or higher.

Inventors:
YAMADA TOMOYA (JP)
IIDA TOMOHIDE (JP)
Application Number:
JP2012/056955
Publication Date:
September 27, 2012
Filing Date:
March 19, 2012
Export Citation:
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Assignee:
DOWA ELECTRONICS MATERIALS CO (?1010021, JP)
DOWA IP CREATION CO LTD (?7028053, JP)
YAMADA TOMOYA (JP)
IIDA TOMOHIDE (JP)
International Classes:
G03G9/107; G03G9/113
Foreign References:
JP2010181524A2010-08-19
JP2010039368A2010-02-18
JP2010243798A2010-10-28
JP2011008199A2011-01-13
JPS6263970A1987-03-20
JP2010066490A2010-03-25
Other References:
See also references of EP 2690499A4
Attorney, Agent or Firm:
Yamada Shigeki (Naraken-Ringyokaikan 3F, 6 Nashihara-ch, Nara-city Nara 53, 〒6308253, JP)
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Claims: