G - Physics – 03 – G
Patent
G - Physics
03
G
75/155, 148/20,
G03G 9/08 (2006.01) B22F 9/00 (2006.01) C23C 22/24 (2006.01) G03G 9/107 (2006.01)
Patent
CA 1144796
ABSTRACT OF THE DISCLOSURE Electrographic carrier particles with improved conductivity and stability are prepared from magnetic stainless steel particles of at least 9 weight percent chromium content. The particles are passivated by reaction with nitric acid. This forms a chromium-rich, stable film on the particle surfaces. Before passiva- tion the particles may also be treated, e.g., with hydroflouric acid, to remove surface silicon. The passivated particles, preferably after thinly coating with resin, e.g., poly(vinylidene fluoride), are mixed with toner powder for electrographic dry develop- ment.
353417
Eastman Kodak Company
Gowling Lafleur Henderson Llp
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