Process for developing electrostatic images with magnetic toner

Details Process for developing electrostatic images with magnetic toner Process for developing electrostatic images with magnetic toner

1981-03-13

1983-10-04

Welsh, John D.

Radiation imagery chemistry: process, composition, or product th

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

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

430107, 4301066, 118657, G03G 1309

Patent

active

044079257

ABSTRACT:
This invention is directed to a process for charging magnetic toner particles contained in a xerographic developer composition, the developer composition being comprised of conductive magnetic carrier particles and substantially uncharged magnetic toner particles, said process comprising transporting by an electrode transporting member the magnetic toner particles into close proximity of the electrical potential existing in the region of an imaging bearing member of an electrophotographic, or electrographic imaging system containing a magnetic brush development device whereby charge of a polarity opposite to that of the electrical potential is induced into the toner particles, causing the toner particles to possess a resistivity of from about greater than 10.sup.15 ohms-cm to about less than about 10.sup.18 ohms-cm, the effective distance between said image bearing member and said electrode transporting member being from about 5 micrometers to about 100 micrometers. Developers containing such toner materials can be used to develop images in electrophotographic, or electrographic imaging systems.

REFERENCES:
patent: 3262806 (1966-07-01), Gourge
patent: 3345294 (1967-10-01), Cooper
patent: 3906121 (1975-09-01), Fraser et al.
patent: 4176078 (1979-11-01), Lu
patent: 4187330 (1980-02-01), Harada et al.
patent: 4192902 (1980-03-01), Lu
patent: 4198477 (1980-04-01), Williams et al.

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