Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1994-08-29
1996-04-30
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, G03G 9107
Patent
active
055124046
ABSTRACT:
Carrier particles for an electrostatographic developer comprising a mixture of particles of a hard, magnetic ferrite material having a hexagonal crystalline structure of the general formula M0.6 Fe.sub.2 O.sub.3 in which M is strontium, barium or mixtures thereof exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/g when in an applied magnetic field of 1000 Oersteds in which from 1.0 to 10.0% by weight of the carrier particles in the mixture, based on the total weight of the mixture, have a number average particle diameter of from 1.0 to 10.0 micrometers and from 99.0 to 90.0% by weight of the carrier particles in the mixture, based on the total weight of the mixture, have a number average particle diameter of from 11.0 to 38.0 micrometers.
The carrier particles provide developer compositions for magnetic brush development having high development speeds without the loss of copy image quality.
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Eastman Kodak Company
Martin Roland
Montgomery Willard G.
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