Magnetic toner for electrophotography

Details Magnetic toner for electrophotography Magnetic toner for electrophotography

1978-02-01

1979-01-30

Goolkasian, John T.

Compositions

Electrolytes for electrical devices

96 1SD, 252 6254, 264117, 427213, 264 15, G03G 914

Patent

active

041371887

ABSTRACT:
An insulating magnetic toner useful as a one component developer for electro-photography consisting essentially of a ferro-magnetic material, a resin and a charge controlling agent. The preferred toner mixture has an average particle size in the range from about 7 to about 30 .mu.m and is substantially free of particles having a size smaller than 1 .mu.m. The toner is preferably prepared by mixing a ferromagnetic material, a resin and a charge controlling agent, heat kneading, cooling and then granulating the mixture to form fine particles, contacting the pacticles with a hot gas of a temperature higher than the toner softening point and lower than 500.degree. C to fuse particles smaller than about 1 .mu.m to larger particles, cooling and selecting the particles of an average particle size of about 7 to about 30 .mu.m.

REFERENCES:
patent: 3196032 (1965-07-01), Seymour
patent: 3627682 (1971-12-01), Hall et al.
patent: 3639245 (1972-02-01), Nelson
patent: 3645770 (1972-02-01), Flint
patent: 3674736 (1972-07-01), Lerman et al.
patent: 3909258 (1975-09-01), Kutz

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