MAGNETIC CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPERS, PROCESS FOR PRODUCTION THEREOF, AND TWO-COMPONENT DEVELOPERS

Title:

MAGNETIC CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPERS, PROCESS FOR PRODUCTION THEREOF, AND TWO-COMPONENT DEVELOPERS

Document Type and Number:

WIPO Patent Application WO/2010/140677

Kind Code:

A1

Abstract:

A magnetic carrier for electrophotographic developers which consists of spherical magnetic composite particles prepared by binding ferromagnetic iron oxide particles with a phenol resin, characterized in that the ten-point mean roughness (Rz) of the surfaces of the spherical magnetic composite particles is 0.3 to 2.0μm. The magnetic carrier for electrophotographic developers exhibits excellent durability in terms of peeling of a resin coat and abrasion, is stable to mechanical stress applied thereto, and does not create spent toner. Thus, the magnetic carrier can be stably maintained over a long period without causing fog and density unevenness, and makes it possible to produce high-quality images with excellent gradation over a long period.

Inventors:

IWAMI KATSUJI (JP)
HARADA SHIGENORI (JP)
KURITA EIICHI (JP)
KINOSHITA KAORI (JP)

Application Number:

PCT/JP2010/059512

Publication Date:

December 09, 2010

Filing Date:

June 04, 2010

Export Citation:

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Assignee:

TODA KOGYO CORP (JP)
IWAMI KATSUJI (JP)
HARADA SHIGENORI (JP)
KURITA EIICHI (JP)
KINOSHITA KAORI (JP)

International Classes:

G03G9/107; G03G9/113

Foreign References:

JP2008083098A	2008-04-10
JPH03192268A	1991-08-22
JPH09311505A	1997-12-02
JP2006018129A	2006-01-19
JP2007102052A	2007-04-19
JP2007199267A	2007-08-09
JP2007322892A	2007-12-13
JP2008096623A	2008-04-24
JPH02220068A	1990-09-03
JP2008083098A	2008-04-10
JP2006018129A	2006-01-19
JP2002287431A	2002-10-03
JP2008040270A	2008-02-21
JP2008250214A	2008-10-16
JP2007101731A	2007-04-19
JP2003323007A	2003-11-14
JPH03192268A	1991-08-22
JPH09311505A	1997-12-02

Other References: