Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1994-12-09
1996-05-21
Goodrow, John
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
G03G 9107
Patent
active
055188494
ABSTRACT:
This invention provides a ferrite carrier for an electrophotographic developer characterized in that a core material is ferrite particle composed of 17.0 to 29.0 mol % of Li.sub.2 O and 71.0 to 83.0 mol % of Fe.sub.2 O.sub.3, exhibits a resistance of 2.5.times.10.sup.8 to 2.5.times.10.sup.9 .OMEGA. when a voltage of 250 V is applied, satisfies the relationship: a.sub.1 -a.sub.2 .ltoreq.1.5 when the resistance (R.sub.1) of the ferrite particle exhibited when a voltage of 250 V is applied thereto is taken as a.sub.1 .times.10.sup.b .OMEGA. and the resistance (R.sub.2) thereof exhibited when a voltage of 1000 V is applied thereto is taken as a.sub.2 .times.10.sup.b .OMEGA. (with the proviso that 1.0.ltoreq.a.sub.1 <10, 0.1.ltoreq.a.sub.2, and b is an integer of 6 to 9), and the carrier prepared by coating the ferrite particle with a resin exhibits a resistance of 1.0.times.10.sup.9 to 1.0.times.10.sup.15 .OMEGA. when a voltage 250 V is applied thereto, and has a true specific gravity of 4.70 or below.
REFERENCES:
patent: 5422216 (1995-06-01), Smith et al.
Patent Abstracts of Japan-vol. 8, No. 257 (P-316) Nov. 24, 1984 & JP-A-59 127 054 (Hitachi) Jul. 21, 1984 *Abstract*.
Database WPI-Week 8432 Derwent Publications Ltd., London, GB; AN 84-197300 & JP-A-59 111 158 (Hitachi) Jun. 27, 1984 *abstract*.
Database WPI-Week 8432, Derwent Publications Ltd., London, GB; AN 84-197304 & JP-A-59 111 162 (Hitachi) Jun. 27, 1984 *abstract*.
Honjo Toshio
Ogata Masahiro
Sato Yuji
Shimizu Kouichi
Takei Norio
Goodrow John
Powdertech Co., Ltd.
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