Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1990-04-05
1991-10-29
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...
430137, G03G 900, G03G 500
Patent
active
050615866
ABSTRACT:
Disclosed are two-phase glass composite carrier particles which comprise a composite of a magnetically hard ferrite material having a single phase hexagonal crystalline structure of the formula MO.6Fe.sub.2 O.sub.3 where M is barium, strontium or lead exhibiting a coercivity of at least 300 Oersteds when magnetically saturated and an induced magnetic moment of at least 20 EMU/gm when in an applied field of 1000 Oersteds which is dispersed in a glass matrix comprised of from about 10 to 20 molar percent CuO, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3 ; or a glass matrix comprised of from about 10 to 20 molar percent of V.sub.2 O.sub.5, from about 10 to 40 molar percent BaO and from about 10 to 40 molar percent B.sub.2 O.sub.3.
Also disclosed is an electrostatic two-phase dry developer composition comprising charged toner particles mixed with oppositely charged carrier particles as described above.
A method of developing an electrostatic image by contacting the image with the two-phase dry developer composition also is disclosed. The developer compositions of the invention exhibit reduced toner throw-off and other disclosed advantages.
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Jadwin Thomas A.
Saha Bijay S.
Crossan S.
Eastman Kodak Company
McCamish Marion E.
Montgomery Willard G.
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