Photocopying – Contact printing – Light boxes
Patent
1992-09-10
1995-06-13
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118657, 252 6254, 252 6259, 358301, 4301066, G03G 1509
Patent
active
054248108
ABSTRACT:
A magnetic toner for electrophotography is composed from a binder resin and a silicon-containing magnetic iron oxide. The magnetic toner has a weigh-average particle size o at most 13.5 .mu.m and has a particle size distribution such that it contains o more than 50 wt, % of magnetic toner particles having a particle size of at least 12.7 .mu.m. The magnetic toner is able to show high developing performances because of richness in fine particles and is also provided with an improved environmental stability because the magnetic iron oxide used therein contains 0.5-4 wt, % silicon (based on total iron content) and has a specific silicon distribution such that the magnetic iron oxide has a total silicon content (A), a silicon content (B) dissolved together with the magnetic iron oxide when the magnetic iron oxide is dissolved up to 20 wt, % dissolution of iron, and a superficial silicon content (C), satisfying relations of B/A=44-84% and C/A=10-55%. The performances are enhanced if the magnetic toner is blended with additives such as inorganic fine powder or resin fine particles.
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Kato Masayoshi
Kobori Takakuni
Suematsu Hiroyuki
Tomiyama Koichi
Yusa Hiroshi
Canon Kabushiki Kaisha
Grimley A. T.
Lee Shuk Y.
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