Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1997-03-07
1999-01-12
Le, H. Thi
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
428403, 428694BA, 428900, B32B 516
Patent
active
058585320
ABSTRACT:
Magnetite particles of the present invention have an average particle diameter of 0.05 to 0.50 .mu.m, each of the magnetite particles having a plurality of mountain-shaped protrusions with unsharpened crests on a surface of each magnetite particle, and the number of the mountain-shaped protrusions formed on the surface of each magnetite particle being in the range of 2 to 30 when viewed in projected plan; magnetic iron oxide particles for magnetic toner comprising not less than 60%, in number, of the said magnetite particles; and a magnetic toner comprising the said magnetic iron oxide particles and a binder resin. The magnetite particles of the present invention are free from the falling-off from toner particles. The toner particles of the present invention shows a good fluidity and produces visual images having a higher definition upon development of electrostatic latent images.
REFERENCES:
patent: 4975214 (1990-12-01), Sakashita et al.
Aoki Koso
Fujioka Kazuo
Kozawa Minoru
Misawa Hiromitsu
Miyazaki Sigenori
Le H. Thi
Toda Kogyo Corporation
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