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US 6,294,304 B1Granted
Environmentally benign high conductivity ferrite carrier with widely variable magnetic moment
AssigneePowdertech Co., Ltd.
InventorsAlan Sukovich, William R. Hutcheson
Life of this patent
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Abstract
A ferrite carrier includes manganese oxide, ferric oxide and minor amounts of titanium dioxide and provides an environmentally benign, highly conductive, reprographic carrier powder.
Claims9
A carrier core having a composition consisting essentially of 10 to 50 mole percent of manganese oxide;
- about 90 to 50 mole percent of ferric oxide;
- and
- a titanium dioxide compound comprising 0.5 to 10 percent by weight of the composition, said constituents sintered together and forming a spinel phase, stoichiometric material having a resistivity in the range of about 3×107 to 1×108 ohm cm at 100 volts.
A carrier core particulate, consisting essentially of:
- a powder having an average particle size of about 50 microns, said powder consisting essentially of 0.35-0.45 mole fraction MnO, 0.55-0.65 mole fraction Fe2O3, and 4.5-5.5% by additive weight TiO2, and having a magnetic moment in the range of 60 to 70 emu/g, resistivity of 4-6×107 ohm cm at 100 V and a stoichiometric, spinel crystalline structure.
Dependencies are inferred from the claim text.