Two component developing agent

Details Two component developing agent Two component developing agent

2005-10-27

2008-11-25

Chapman, Mark A (Department: 1795)

Radiation imagery chemistry: process, composition, or product th

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

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

Reexamination Certificate

active

07455946

ABSTRACT:
A two-component developing agent retained on the periphery surface of a magnetic roller11and a development roller12are brought in contact with each other, the nonmagnetic toner in the two-component developing agent is electrostatically adhered to the periphery surface of the development roller12, and the nonmagnetic toner on the development roller12is sprayed on the periphery surface of a photosensitive drum13, thereby causing an image of an electrostatic latent image to appear on the photosensitive drum13as a toner image. The two-component developing agent for an image forming device thus configured comprises a nonmagnetic toner comprising color particles, and a magnetic carrier, wherein the magnetic carrier has a resin coating layer on the magnetic particle surface, and the critical surface tension of this resin coating layer is 25 dyn/cm or less.

REFERENCES:
patent: 4571372 (1986-02-01), Urawa et al.
patent: 4791041 (1988-12-01), Aoki et al.
patent: 4868083 (1989-09-01), Nagatsuka et al.
patent: 4965160 (1990-10-01), Nagatsuka et al.
patent: 5665507 (1997-09-01), Takagi et al.

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