Electrostatic developing toner

Details Electrostatic developing toner Electrostatic developing toner

2007-10-09

2007-10-09

Tran, Hoan (Department: 2852)

Electrophotography

Image formation

Development

C430S106100

Reexamination Certificate

active

11322229

ABSTRACT:
An electrostatic developing toner which can effectively suppress image fogging*1 by setting a ratio (d/D) of the average particle diameter D of the toner and the average particle diameter d of iron oxide particles contained in the toner as a colorant to within a predetermined range, and by setting the value of a ratio (σr/σs) between the residual magnetization σr and saturation magnetization σs of the iron oxide particles to a predetermined value or less, is provided. The value of the ratio (d/D) of the average particle diameter D of the toner and the average particle diameter d of iron oxide particles contained in the toner as a colorant is set to within the range of 0.01-0.03, and the value of the ratio (σr/σs) between the residual magnetization σr and saturation magnetization σs of the iron oxide particles is set to 0.3 or less.

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