Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1985-05-02
1986-08-26
Martin, Roland E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430102, 430120, 118624, 118650, 118653, 361225, 361226, G03G 1308, G03G 1508
Patent
active
046083286
ABSTRACT:
An electrostatographic method and apparatus for developing an electrostatic latent image on an imaging surface, comprises a charging doner member which is preferably a rotatably mounted roll closely spaced from the imaging surface at one portion and having a housing means to be filled with toner positioned adjacent the doner member at another portion together with a web screen located in the housing and adapted to contact the donor member on the portion of its surface opposite the imaging member; the donor member having a surface comprising an active polymer having a basic amine moiety whereby when the donor roll is rotated the rubbing contact between the toner, the screen means and the donor member produces negatively charged toner particles. In a preferred embodiment the active polymer having a basic amine moiety is selected from poly(2-vinylpyridine), poly(4-vinylpyridine), polyvinylpyrolidone, poly (dimethyl aminoethyl methacrylate) and the toner includes a minor amount of fumed silica additive.
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Pochan John M.
Schwarz William M.
Martin Roland E.
Xerox Corporation
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