Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
MAGNETIC CARRIER FOR ELECTROPHOTOGRAPHIC DEVELOPER, PRODUCTION METHOD OF THE MAGNETIC CARRIER, AND TWO-COMPONENT DEVELOPER
Document Type and Number:
Japanese Patent JP2011002497
Kind Code:
A
Abstract:

To provide a magnetic carrier for an electrophotographic developer, the carrier for appropriately keeping an electric resistance value during development, exhibiting excellent image quality and durability, reproducing a uniform solid black portion with high density, and to be used for an electrophotographic developer for maintaining images of high image quality for a long period of time with excellent gradation or the like, and to provide a two-component developer including the magnetic carrier for an electrophotographic developer and a toner.

The magnetic carrier for an electrophotographic developer includes spherical composite core particles having an average particle diameter of 1 to 100 μm and comprising at least ferromagnetic iron oxide fine particles and a cured phenolic resin, and a coating layer of a melamine resin formed on the surfaces of the core particles, is provided, wherein a ratio R100/R300, which is a ratio of an electric resistance value R100 at an application voltage of 100 V to an electric resistance value R300 at an application voltage of 300V, of the carrier ranges from 1 to 50.


Inventors:
KINOSHITA KO
UEMOTO SHINJI
KURITA EIICHI
Application Number:
JP2009143214A
Publication Date:
January 06, 2011
Filing Date:
June 16, 2009
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TODA KOGYO CORP
International Classes:
G03G9/107; G03G9/113
Domestic Patent References:
JPH03192268A1991-08-22
JPH09311505A1997-12-02
JP2008083098A2008-04-10