Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1992-10-29
1993-12-07
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430108, 430111, 252 6263, 252 6264, G03G 9107, G03G 9113
Patent
active
052682498
ABSTRACT:
Carrier particles suitable for magnetic brush development comprising hard magnetic ferrite material having a single phase, W-type hexagonal crystalline structure represented by the formula MFe.sub.16 Me.sub.2 O.sub.27 where M is strontium or barium and Me is a divalent transition metal selected from the group consisting of nickel, cobalt, copper, zinc, manganese, magnesium, iron and mixtures thereof, exhibiting a coercivity of approximately 100 to 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 60 EMU/g when in an applied magnetic field of 1000 Oersteds are disclosed. Also disclosed are electrostatic two-component dry developer compositions comprising charged toner particles mixed with oppositely charged carrier particles comprising the magnetically hard ferrite material described above and a method of developing an electrostatic charge pattern by contacting the charge pattern with a two-component dry developer composition described above.
The carrier particles provide high development efficiencies and improved image density.
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Mutz Alec N.
Saha Bijay S.
Eastman Kodak Company
Martin Roland
Montgomery Willard G.
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