MAGNETIC CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPERS, CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPERS, DEVELOPER, METHOD FOR PRODUCING MAGNETIC CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPERS, METHOD FOR PRODUCING CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPERS, AND METHOD FOR PRODUCING DEVELOPER

Title:

Document Type and Number:

WIPO Patent Application WO/2019/038963

Kind Code:

A1

Abstract:

Provided are: a magnetic core material for electrophotographic developers, which has low environment dependence of the electrical resistance and is capable of suppressing carrier scattering, thereby enabling stable achievement of good images; a carrier for electrophotographic developers; a developer which contains the carrier; a method for producing a magnetic core material for electrophotographic developers; a method for producing a carrier for electrophotographic developers; and a method for producing a developer. A magnetic core material for electrophotographic developers, which is configured such that if a (ppm) is the amount of fluorine ions, b (ppm) is the amount of chlorine ions, c (ppm) is the amount of bromine ions, d (ppm) is the amount of nitrite ions, e (ppm) is the amount of nitrate ions and f (ppm) is the amount of sulfate ions as determined by combustion ion chromatography, the value of formula (1) a + b × 10 + c + d + e + f is 20-150.

Inventors:

SAWAMOTO HIROKI (JP)
UEMURA TETSUYA (JP)

Application Number:

PCT/JP2018/008658

Publication Date:

February 28, 2019

Filing Date:

March 06, 2018

Export Citation:

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Assignee:

POWDERTECH CO LTD (JP)

International Classes:

G03G9/107; G03G9/113

Domestic Patent References:

WO2017175646A1

2017-10-12

Foreign References:

JP2011227452A	2011-11-10
JP2009234839A	2009-10-15
JP2012181398A	2012-09-20
JP2016025288A	2016-02-08
JP2013072890A	2013-04-22
US6143456A	2000-11-07
JP2005106999A	2005-04-21
JP2012181398A	2012-09-20
JP2016025288A	2016-02-08
JP2017162631A	2017-09-14

Other References: