Magnetite particles, a process for producing them and applicatio

Details Magnetite particles, a process for producing them and applicatio Magnetite particles, a process for producing them and applicatio

1997-09-26

1999-03-23

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

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

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

252 6256, G03G 9107, C01G 4902

Patent

active

058857400

ABSTRACT:
Magnetite particles that contain 0.1-5.0 wt % of P, 0.1-5.0 wt % of Al and optionally up to 5.0 wt % of Si on the basis of Fe, that have .sigma..sub.r /SSA ratio of no more than 0.9 (.sigma..sub.r, residual magnetic flux density; SSA, specific surface area) after the application of 1 kOe and that are hexahedral, octahedral or tetradecahedral in shape have a sufficiently low residual magnetic flux density that they are suitable for use as magnetic toners or resin-dispersed carriers in electrostatic copying.

REFERENCES:
patent: 3652334 (1972-03-01), Abeck et al.
patent: 5512194 (1996-04-01), Ogasawara et al.
patent: 5733471 (1998-03-01), Hashiuchi et al.

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