Process for charging magnetic toner

G - Physics – 03 – G

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117/2.8

G03G 13/09 (2006.01) G03G 9/08 (2006.01) G03G 9/107 (2006.01) G03G 9/113 (2006.01)

Patent

CA 1175299

ABSTRACT OF THE DISCLOSURE 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 1015 ohms-cm to about less than about 1018 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 electro- graphic imaging systems.

394895

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