Electrophotographic toner for negative charging

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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G03G 9097

Patent

active

052158500

ABSTRACT:
The electrophotographic toner for negative charging according to the present invention is characterized in that a polyester resin is used as a fixing resin and a quaternary ammonium salt having an oxyacid anion is used as a charge-controlling assistant in combination with a charge-controlling agent for negative charging. 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: 4401741 (1983-08-01), Miyakawa et al.

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