Liquid electrographic developers containing quaternary ammonium

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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430112, 430116, G03G 912

Patent

active

045474494

ABSTRACT:
Liquid electrographic developers are disclosed comprising an electrically insulating liquid carrier, toner, a charge-control agent and a charging agent. The charge-control agent is a carrier-soluble, addition copolymer of a quaternary ammonium salt monomer, a monomer having --COOH, --SO.sub.3 H or --PO.sub.3 HR acidic function wherein R is hydrogen or alkyl, and a solubilizing monomer. The charging agent is a carrier-soluble, addition polar copolymer. The disclosed developers exhibit improved replenishability as evidenced by reduced buildup of charge in the developers during the course of use and repeated replenishment.

REFERENCES:
patent: 3849165 (1974-11-01), Stahly et al.
patent: 3977983 (1976-08-01), Tsuneda
patent: 4170563 (1979-10-01), Merrill et al.
patent: 4229513 (1980-10-01), Merrill et al.
patent: 4252921 (1981-02-01), Merrill et al.
patent: 4273849 (1981-06-01), Merrill et al.

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