Interdispersed two-phase ferrite composite and carrier therefrom

Details Interdispersed two-phase ferrite composite and carrier therefrom Interdispersed two-phase ferrite composite and carrier therefrom

1988-08-05

1989-08-08

Martin, Roland E.

Radiation imagery chemistry: process, composition, or product th

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

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

430108, 252 6257, G03G 910, G03G 914

Patent

active

048552054

ABSTRACT:
Disclosed is an interdispersed two-phase ferrite composite which comprises about 0.1 mole to about 1.0 mole of a spinel phase having the general formula MFe.sub.2 O.sub.4 where M is at least one element that forms a spinel ferrite, to about 2.5 moles of a magnetoplumbite phase having the general formula R.sub.x P.sub.1-x Fe.sub.12 O.sub.19 where R is selected from rare earth elements, P is selected from the group consisting of strontium, barium, calcium, lead, and mixtures thereof, and x has a value of from about 0.1 to about 0.4. Also disclosed is a carrier formed from magnetized and polymerically coated particles of the composite, a developer formed from a carrier and a toner, and a magnetic brush formed from a multiplicity of juxtaposed magnetically aligned hairs formed of the carrier.

REFERENCES:
patent: 2900344 (1959-08-01), Stuyts et al.
patent: 3996392 (1976-12-01), Berg et al.
patent: 4172722 (1979-10-01), Hirakura et al.
patent: 4540645 (1985-09-01), Honda et al.
patent: 4623603 (1986-11-01), Iimura et al.
Japanese Patent Abstract No. J56100165-A (J85054907-B).
Netherlands Patent Abstract NL7401198-A (DE2404636-A).

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