Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1986-05-22
1988-05-03
Goodrow, John L.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430110, 430137, G03G 910
Patent
active
047419849
ABSTRACT:
A positively chargeable developer, comprising: positively chargeable toner particles, positively chargeable silicate fine powder having a positive triboelectric chargeability higher than that of the toner and a mean particle size of 3 microns or smaller, and a microdisperser having a triboelectric chargeability lower than that of the toner and a mean particle size which is larger than that of the silicate powder and smaller than that of the toner particles. The microdisperser has a function of disintegrating particularly the positively chargeable silicate fine powder and enhances the attachment thereof to the toner particles, whereby the developing characteristics including the triboelectric chargeability are stabilized from the initial stage of electrophotographic copying operation, and the storage stability is also improved.
REFERENCES:
patent: 4618556 (1986-10-01), Takenouchi
patent: 4626487 (1986-12-01), Mitsuhashi
patent: 4640882 (1987-02-01), Mitsuhashi et al.
Hino Takashi
Imai Eiichi
Canon Kabushiki Kaisha
Goodrow John L.
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