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Title:
FERRITE CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER, FERRITE CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, ELECTROPHOTOGRAPHIC DEVELOPER, AND METHOD FOR PRODUCING FERRITE CARRIER CORE MATERIAL FOR ELECTROPHOTOGRAPHIC DEVELOPER
Document Type and Number:
WIPO Patent Application WO/2017/175646
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing: a ferrite carrier core material that is for an electrophotographic developer, that makes it possible to obtain desired resistance characteristics and desired charging characteristics while maintaining the advantages of a ferrite carrier, and in which the environmental fluctuation of resistance and charge amount is small; a ferrite carrier for an electrophotographic developer; an electrophotographic developer using the ferrite carrier; and a method for producing the ferrite carrier core material for an electrophotographic developer. In order to solve the abovementioned problem, the present invention uses a ferrite carrier core material characterized by having Zr unevenly distributed on the surface of ferrite particles containing 15-25 mass% of Mn, 0.5-5.0 mass% of Mg, 0.05-4.0 mass% of Sr, and 45-55 mass% of Fe.

Inventors:
SUGIURA TAKAO (JP)
ISHII KAZUTAKA (JP)
AGA KOJI (JP)
Application Number:
PCT/JP2017/013052
Publication Date:
October 12, 2017
Filing Date:
March 29, 2017
Export Citation:
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Assignee:
POWDERTECH CO LTD (JP)
International Classes:
G03G9/107; G03G9/113
Foreign References:
JP2003533745A2003-11-11
JP2011180296A2011-09-15
Attorney, Agent or Firm:
YOSHIMURA, Katsuhiro (JP)
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