MAGNETIC CARRIERS FOR ELECTROPHOTOGRAPHIC DEVELOPER, PROCESSES FOR PRODUCING SAME, AND TWO-COMPONENT DEVELOPER

WIPO Patent Application WO/2013/180212

A1

The present invention relates to: a magnetic carrier for electrophotographic developers which comprises spherical composite core particles that comprise fine ferromagnetic iron oxide particles and a cured phenolic resin and that have an average particle diameter of 20-60 µm, wherein (σ1-σ0) is in the range of -2 to 0, where σ0 is the saturation magnetization (Am2/kg) of carrier particles that have a particle diameter approximately equal to the average particle diameter of the magnetic carrier for electrophotographic developers and σ1 is the saturation magnetization (Am2/kg) of carrier particles having a particle diameter smaller than 20 µm; and a two-component developer obtained using the magnetic carrier. This two-component developer comprises a toner and a magnetic carrier for use in electrophotographic developers which have durability, cause no carrier adhesion, and enable long-term formation of high-quality images.

KINOSHITA KAORI (JP)
KURITA EIICHI (JP)

PCT/JP2013/065013

December 05, 2013

May 30, 2013

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TODA KOGYO CORP (JP)

G03G9/107; G03G9/113

JP2003043756A	2003-02-14
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JP2007271662A	2007-10-18
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JP2011002497A	2011-01-06
JP2010014853A	2010-01-21
JPH02220068A	1990-09-03
JPH086303A	1996-01-12
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JPH09311505A	1997-12-02
JP2000039742A	2000-02-08
JP2007206481A	2007-08-16
JP2002296846A	2002-10-09
JP2005099072A	2005-04-14
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JP2000199985A	2000-07-18

See also references of EP 2857903A4

OKADA, KAZUHIKO (JP)
Kazuhiko Okada (JP)

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