Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making developer composition
Reexamination Certificate
2005-09-19
2008-11-11
Dote, Janis L (Department: 1795)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Process of making developer composition
C430S108700, C430S110400
Reexamination Certificate
active
07449275
ABSTRACT:
A process for preparing a toner including the steps of (I) melt-kneading a raw material mixture containing a resin binder and a colorant; (II) cooling the melt-kneaded mixture obtained in the step (I) and pulverizing the cooled mixture to give a pulverized product having a volume-median particle size (D50v) of from 10 to 1000 μm; (III) pulverizing the pulverized product obtained in the step (II) in the presence of an external additive having an average particle size of from 8 to 50 nm; and (IV) classifying the pulverized product obtained in the step (III), wherein the resulting toner has a volume-median particle size (D50v) of from 3.5 to 8 μm, and the total amount of m kind(s) of external additive(s) in the step (III) satisfies a specified formula. The toner can be used, for instance, for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.
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Dote Janis L
Kao Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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