Patent · US Active

Ferrite core material and ferrite carrier for electrophotographic developer, and electrophotographic developer using the ferrite carrier

US8535867B2 · kind B2 · utility

2Cited by

0References

10Claims

0Family size

Assignee

Powdertech Co., Ltd. · JP

Inventors

Tomoyuki Suwa · Nagareyama, JP
Toru Iwata · Yokohama, JP
Koji Aga · Kashiwa, JP

Key dates

Filing date	Feb 3, 2011
Grant date	Sep 17, 2013
Priority date	—
Expiry date	Aug 25, 2031

Classification

Technology area (CPC G)Physics
CPC primaryG03G9/1075
WIPO fieldOptics
WIPO sectorInstruments

Abstract

There is provided a ferrite core material for an electrophotographic developer, the ferrite core material having a ferrite particle composition represented by the formula (1) shown below, containing SrO replacing a part of (MnO) and/or (MgO) in the formula (1) shown below, and having a Cl concentration of 0.1 to 100 ppm, as measured by an elution method of the ferrite core material:(MnO)x(MgO)y(Fe2O3)z (1)wherein x=35 to 45 mol %, y=5 to 15 mol %, z=40 to 60 mol %, and x+y+z=100 mol %.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.