Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Process of making developer composition
Reexamination Certificate
2005-04-20
2010-10-26
RoDee, Christopher (Department: 1795)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Process of making developer composition
C430S109400
Reexamination Certificate
active
07820354
ABSTRACT:
The present invention relates to a process for producing a toner including the steps of melt-kneading raw materials containing two or more kinds of polyesters, heat-treating a melt-kneaded product, pulverizing a heat-treated product, and classifying a pulverized product, wherein the two or more kinds of polyesters contain at least one kind of an amorphous polyester, and the heat-treating step is carried out at a temperature t (° C.) and time h (hour) satisfying the following formulas (a) and (b),in-line-formulae description="In-line Formulae" end="lead"?Tg1≦t≦Tm−10 (a)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?h≧100/(t−30), with proviso thatt>30 (b)in-line-formulae description="In-line Formulae" end="tail"?wherein Tg1is a glass transition temperature (° C.) of the melt-kneaded product before the heat-treating step; and Tm is the lowest softening point (° C.) of softening points of the two or more kinds of polyesters, and the toner produced by the process. The toner obtained according to the present invention is suitably used, for example, for developing latent images formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.
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U.S. Appl. No. 12/541,483, filed Aug. 14, 2009, Shirai, et al.
Kao Corporation
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
RoDee Christopher
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