Toner compositions with conductive colored magnetic particles
AssigneeXerox Corporation
InventorsGuerino G. Sacripante, Richard P. N. Veregin
Life of this patent
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Abstract
A toner composition comprised of resin particles, pigments, and a colored highly conductive magnetic composition comprised of a core comprised of a metal, and thereover a coating comprised of a lightly colored metal selected from the group consisting of copper, silver, cobalt, tin, gold, manganese, titanium, magnesium, vanadium, chromium, zinc, cadmium, indium, rhodium, niobium, platinum and aluminum, and in contact with the lightly colored metal a top coating comprised of a substantially colorless metal halide.
Claims37
A toner composition comprised of resin particles, pigment, and a colored highly conductive magnetic composition comprised of a core comprised of a metal, and thereover a coating comprised of a lightly colored metal selected from the group consisting of copper, silver, cobalt, tin, gold, manganese, titanium, magnesium, vanadium, chromium, zinc, cadmium, indium, rhodium, nobium, platinum and aluminum, and in contact with the lightly colored metal a top coating comprised of a substantially colorless metal halide.
A process for the preparation of colored conductive magnetic particles which comprises dispersing magnetic metal particles of iron, cobalt, or nickel in a solvent of water, and aliphatic alcohol containing a soluble metal salt of copper sulfate, silver nitrate or tin sulfate;
- wherein the electrochemical reduction potential of the soluble metal salt is more positive, form about 10.sup.-2 volts to about 10 volts, than the electrochemical reduction potential of the metal particle of iron, nickel, or cobalt to be coated;
- and wherein an electrochemical oxidation-reduction reaction occurs at the particle surface, wherein the core metal particle of iron, cobalt or nickle surface is oxidized to iron sulfate, cobalt nitrate or nickel sulfate, and dissolved in the solvent concurrently with the metal salt being reduced is a lightly colored metal coating of copper, silver or tin metal on the magnetic core of iron, cobalt or nickel surface.
Dependencies are inferred from the claim text.