Electrophotographic developer containing positively chargeable t

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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430107, G03G 910

Patent

active

048371009

ABSTRACT:
A positively chargeable electrophotographic developer is disclosed, comprising a carrier, toner particles positively chargeable by friction with the carrier, fine particles of hydrophilic alumina, and fine particles of one of tin oxide, hydrophobic silica and titanium dioxide. The developer hardly undergoes toner cloud or toner dropping during development and suffers neither extreme deterioration in charging properties nor fog formation even when used for taking a large number of copies.

REFERENCES:
patent: 3557255 (1971-01-01), Sharkey
patent: 3585257 (1971-06-01), Mueller et al.
patent: 4543312 (1985-09-01), Murakawa et al.
patent: 4699865 (1987-10-01), Mitsuhashi

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