Electrophotographic magnetic dry developer containing cerium oxi

Details Electrophotographic magnetic dry developer containing cerium oxi Electrophotographic magnetic dry developer containing cerium oxi

1988-09-12

1989-04-25

Welsh, J. David

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430903, 430110, G03G 914

Patent

active

048247529

ABSTRACT:
A magnetic dry developer, comprising negatively chargeable insulating magnetic toner particles containing, at least, a binder resin, a magnetic substance, and an organo-chromium or -zinc complex; cerium oxide particles containing CeO.sub.2 as a predominant component and having a volume average particle size of 1.0 to 4.0 microns, a heating loss of 0.5 wt. % or less on heating up to 100.degree. C. and a BET specific surface area of 15 m.sup.2 /g or less as measured by the nitrogen adsorption method; and hydrophobicity-imparted negatively chargeable silicon oxide particulates. The cerium oxide particles have a function of disintegrating particularly the hydrophobicity-imparted silicon oxide particulates and enhance the attachment thereof to the toner particles, whereby the developing characteristics including the magnetic triboelectric chargeability are stabilized from the initial stage of electrophotographic copying operation.

REFERENCES:
patent: 3547822 (1970-12-01), Miller
patent: 3826747 (1974-07-01), Nagashima et al.
patent: 3926824 (1975-12-01), Lipani et al.
patent: 4108786 (1978-08-01), Takayama
patent: 4245022 (1981-01-01), Sadamatsu
patent: 4535048 (1985-08-01), Inoue et al.
patent: 4626487 (1986-12-01), Mitsuhashi

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