Toner used with electrophotography

Details Toner used with electrophotography Toner used with electrophotography

2006-12-05

2006-12-05

Goodrow, John L (Department: 1756)

Radiation imagery chemistry: process, composition, or product th

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

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

C430S108700

Reexamination Certificate

active

07144666

ABSTRACT:
A toner having toner particles containing a binder resin and a colorant; and a first external additive having 0.1 to 3.0 wt % of large silica particles with an average particle size of 20 to 200 nm; a second external additive having 0.1 to 3.0 wt % of small silica particles with an average particle size of 5 to 20 nm; a third external additive having 0.1 to 2.0 wt % of hydrophobic titanium dioxide microparticles with a resistance of 105 to 1012 Ωcm; and a fourth external additive having at least one of 0.1 to 2.0 wt % of conductive titanium dioxide particles with a resistance of 1 to 105 Ωcm and 0.1 to 2.0 wt % of positively chargeable aluminum oxide particles. Therefore, a thin toner layer with a uniform toner amount is formed on a toner carrier and stable charge distribution and toner flowability are maintained for a long time, thereby resulting in prevention of fog and toner scattering, and improvements in developing efficiency and toner durability.

REFERENCES:
patent: 6022661 (2000-02-01), Kurose et al.
patent: 2003/0157419 (2003-08-01), Miyakawa et al.
patent: 2003/0165761 (2003-09-01), Arai et al.
patent: 2003/0190543 (2003-10-01), Sugiura et al.
patent: 1195486 (1989-08-01), None
patent: 11295921 (1999-10-01), None

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