Dry electrostatographic developer composition

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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4301066, 430109, 430111, 430137, G03G 900, G03G 500, G03G 9083, G03G 9107

Patent

active

053127110

ABSTRACT:
A negatively-chargeable dry electrostatographic developer is disclosed containing fluorinated inorganic microparticles, and toner particles comprising an acidic binder resin having an acid value between 10 and 30 mg KOH/G and not comprising (a) charge-controlling agent(s). The developers according to this invention show excellent fluidity and have improved negative chargeability. According to a preferred mode, fluorinated silica-type microparticles are added to the developer as free flowing additive in an amount of 0.1 to 5% by weight with respect to the toner, which preferably comprises an acidic carbon black.

REFERENCES:
patent: 4748474 (1988-05-01), Kurematsu et al.
patent: 4973540 (1990-11-01), Machida et al.

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