Electrophotographic one component magnetic toner comprising hydrophobic silica and iron oxide
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United States of America Patent
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Aug 7, 1990
Issued Date -
N/A
app pub date -
May 8, 1989
filing date -
Apr 1, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is an electrophotographic magnetic toner comprising 40-80% binder resin, a waxy material such as a low molecular weight polypropylene or polyethylene, a charge control agent and 20-60% iron oxide having a number average particle size of 0.2-0.7 microns and wherein trivalent Fe is present in excess and wherein the iron oxide contains 16-25% FeO and about 75-84% Fe.sub.2 O.sub.3.
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