Carrier core material, coated carrier, two-component...

Details Carrier core material, coated carrier, two-component... Carrier core material, coated carrier, two-component...

2007-02-27

2007-02-27

Rodee, Christopher (Department: 1756)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

C430S111410, C430S111310

Reexamination Certificate

active

10774045

ABSTRACT:
A carrier core material for an electrophotographic developing agent, which comprises 100 parts by weight of a ferrite component represented by a formula (A) and 0.1 to 5.0 parts by weight of ZrO2that is present in the ferrite component without forming a solid solution, and which has a magnetization, at 1000(103/4π·A/m), of 65 to 85 Am2/kg and an electrical resistance, at an applied voltage of 1000 V, of 105to 109Ω.in-line-formulae description="In-line Formulae" end="lead"?(MnO)x(MgO)y(Fe2O3)z  (A)in-line-formulae description="In-line Formulae" end="tail"?wherein x, y and z are each expressed in % by mol and are numbers satisfying the conditions of 40≦x≦60, 0.1≦y≦10 and x+y+z=100. Also disclosed is a two-component developing agent comprising a coated carrier, which is obtained by coating the above carrier core material with a resin, and toner particles. Further disclosed is an image forming method comprising developing an electrostatic latent image formed by the use of an alternating electric field, with the two-component developing agent. The carrier core material and the coated carrier have high magnetization and high resistance. According to the two-component developing agent of the invention, an excellent image can be formed.

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