Magnetic developer and process for preparation thereof

Details Magnetic developer and process for preparation thereof Magnetic developer and process for preparation thereof

1980-01-30

1982-05-11

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430137, 430903, 430111, G03G 914

Patent

active

043294154

ABSTRACT:
A composite magnetic developer having a self-friction-chargeability is in the form of fixable magnetic particles having a particle size of 5 to 30 microns and comprising a finely divided magnetic material dispersed in a binder medium which shows an adhesiveness under application of heat and pressure, in which the fixable magnetic particles contain fine particles of a magnetic material embedded in the surface of the fixable magnetic particles in an amount of 1 to 10% by weight based on the fixable magnetic particles and fine particles of a magnetic material adhering to the surface of the fixable magnetic particles without being embedded therein in an amount of 1 to 20% by weight based on the fixable magnetic particles. This developer provides a sharp and clear transfer image having a high density without fogging or edge effects on a transfer sheet having a low electric resistance such as a plain paper. When this developer is used for development of electrostatic latent images, any particular charging operation need not be performed and any carrier need not be used. Even if this developer is used repeatedly for the copying operation, the composition is not substantially changed and good developing characteristics are retained.

REFERENCES:
patent: 3196032 (1965-07-01), Seymour
patent: 3645770 (1972-02-01), Flint
patent: 4082681 (1978-04-01), Takayama et al.
patent: 4189390 (1980-02-01), Noguchi

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