Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1991-11-27
1993-07-06
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430110, G03G 9097
Patent
active
052253007
ABSTRACT:
The electrophotographic toner for negative charging according to the present invention is characterized in that a metal compound of an aromatic hydroxycarboxylic acid is used as a charge-controlling agent for negative charging and a quaternary ammonium salt having an oxyacid anion is used as a charge-controlling assistant in combination with the charge-controlling agent. This quaternary ammonium salt used as the assistant is incompatible with a fixing resin but dispersible therein. Therefore, the toner of the present invention provides a sharp distribution of the charge quantity, and formation of a highly charged toner having no contribution to development or a lowly charged toner causing scattering of the toner can be effectively prevented.
REFERENCES:
patent: 4404271 (1983-09-01), Kawagishi et al.
patent: 4894308 (1990-01-01), Mahabadi et al.
Fuji Kazuo
Kubo Masahiko
Kuramae Yoshihisa
Tsubota Noriaki
Watanabe Akihiro
Goodrow John
Mita Industrial Co. Ltd.
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