Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2006-08-01
2006-08-01
Dote, Janis 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...
C430S108200, C430S108210, C430S108300, C430S108700, C106S490000, C106S491000, C428S405000
Reexamination Certificate
active
07083888
ABSTRACT:
An external additive for electrostatically charged image developing toner is provided. The additive includes spherical hydrophobic fine silica particles having primary particles with a particle diameter of from 0.01 to 5 μm and having been treated with a compound selected from the group consisting of a quaternary ammonium salt compound, a fluoroalkyl-group- or fluoroalkenyl-group- containing betaine compound and a silicone oil. The fine silica particles fulfill conditions (i) and (ii), as described in the disclosure. The external additive does not react or has no interaction with an organic photoreceptor and therefore change in quality does not occur or the photoreceptor is not scraped. Furthermore, it has a good flowability and therefore adhesion of a toner to the photoreceptor does not occur.
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Kudo Muneo
Tanaka Masaki
Dote Janis L.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Shin-Etsu Chemical Co. , Ltd.
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