Toner with organically treated alumina for developing electrosta

Details Toner with organically treated alumina for developing electrosta Toner with organically treated alumina for developing electrosta

1995-12-28

1997-03-04

Martin, Roland

Radiation imagery chemistry: process, composition, or product th

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

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

430111, G03G 9097

Patent

active

056078064

ABSTRACT:
A toner for developing electrostatic images includes: toner particles and organically treated alumina powder. The organically treated alumina powder has an X-ray diffraction characteristic showing a maximum X-ray intensity level I.sub.a-max and a minimum X-ray intensity level I.sub.a-min in a 2.theta. range of 20 to 70 degrees providing a ratio I.sub.a-max /I.sub.a-min of below 6. The alumina powder is amorphous or has a low-crystallinity of .gamma.-form, thereby showing a low agglomeratability to function as an effective flowability-improving agent for a toner. The structural water contained in the alumina powder contained favors hydrophobization treatment thereof and functions to suppress a charge-up phenomenon in a low humidity environment after the hydrophobization.

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patent: 5334472 (1994-08-01), Aoki et al.
patent: 5503954 (1996-04-01), Maruta et al.
Patent Abstrs. of Japan, vol. 18, No. 405 (P-1778), Jul. 1994 for JP6-188690.
Patent Abstrs. of Japan, vol. 8, No. 196 (P-299) [1633], Sep. 1984 for for JP 59-084258.

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