Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1990-09-14
1992-04-14
McCamish, Marion 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
Patent
active
051047616
ABSTRACT:
Disclosed is an interdispersed three-phase ferrite composite which comprises from 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 and is selected from the group consisting of cobalt, manganese, iron and mixtures thereof, to about 2.5 moles of a magnetoplumbite phase having the general formula PO.6Fe.sub.2 O.sub.3 where P is selected from the group consisting of strontium, barium, calcium, lead and mixtures thereof and, as a third phase, from about 0.02 to about 2.0 percent by weight, based on the combined weight of the spinel phase and the magnetoplumbite phase, of TiO.sub.2 or SiO.sub.2.
Also disclosed are carrier particles formed from magnetized particles of the composite which optionally can be polymerically coated, an electrostatic charged toner particles mixed with oppositely charged carrier particles formed from magnetized, and optionally polymerically coated, particles of the composite, and a method of developing an electrostatic image by contacting the image with a two-component dry developer composition described above.
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patent: 4855206 (1989-08-01), Saha
U.S. application Ser. No. 504,824, entitled Glass Composite Magnetic Carrier Particles, filed Apr. 5, 1990.
Mutz Alec N.
Saha Bijay S.
Zeman Robert E.
Eastman Kodak Company
McCamish Marion E.
Montgomery Willard G.
Rosasco S.
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