Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
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
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 (217, Toyofuta, Kashiwa-sh, Chiba 57, 〒2278557, JP)
UEMURA Tetsuya (217, Toyofuta, Kashiwa-sh, Chiba 57, 〒2778557, JP)
Application Number:
JP2018/008658
Publication Date:
February 28, 2019
Filing Date:
March 06, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
POWDERTECH CO., LTD. (217 Toyofuta, Kashiwa-shi Chiba, 57, 〒2778557, JP)
International Classes:
G03G9/107; G03G9/113
Domestic Patent References:
WO2017175646A12017-10-12
Foreign References:
JP2011227452A2011-11-10
JP2009234839A2009-10-15
JP2012181398A2012-09-20
JP2016025288A2016-02-08
JP2013072890A2013-04-22
US6143456A2000-11-07
Attorney, Agent or Firm:
KOH-EI PATENT FIRM, P.C. (Toranomon East Bldg. 9F, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
Download PDF: