Developer for electrostatic latent image development

Details Developer for electrostatic latent image development Developer for electrostatic latent image development

1996-09-10

1998-03-24

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

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

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

430122, G03G 9083

Patent

active

057311218

ABSTRACT:
A developer for developing an electrostatic latent image by a developing method of a type in which residual toner particles on an image-bearing member are recovered therefrom and reused for developing the electrostatic latent image, which comprises a magnetic toner and a magnetic carrier. The magnetic toner comprises a binder resin having a number average molecular weight of 2,000-100,000, a weight average molecular weight of 5,000-500,000, and a melt viscosity of 10.sup.5 P or less at 120.degree. C., a release agent having a softening point of 160.degree. C. or lower; and a magnetic powder. The magnetic toner particle is externally added on a surface thereof or internally added thereto with a surface treating agent comprising a fine powder of at least one metal salt of stearic acid, a fine powder of at least one inorganic oxide and an optional resin powder.

REFERENCES:
patent: 4693952 (1987-09-01), Koizumi et al.
patent: 5225301 (1993-07-01), Yushina et al.
patent: 5552252 (1996-09-01), Lundy et al.

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