Magnetic toner particles comprising magnetite particles containi

Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...

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428402, 428407, 428694BA, 430111, B32B 516

Patent

active

061034371

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 particle 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: 4946755 (1990-08-01), Inoue
patent: 4975214 (1990-12-01), Sakashita et al.
patent: 5504272 (1996-04-01), Uchiyama et al.
patent: 5556571 (1996-09-01), Hashiuchi et al.
patent: 5618647 (1997-04-01), Kukimoto et al.
patent: 5858532 (1999-01-01), Kozawa et al.

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