Dry electrostatographic developer composition
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United States of America Patent
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May 17, 1994
Grant Date -
N/A
app pub date -
Jul 16, 1991
filing date -
Jul 19, 1990
priority date (Note) -
Expired
status (Latency Note)
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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.
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