Magnetic toner compositions
AssigneeXerox Corporation
InventorsJoseph R. Matalevich, Douglas A. Lundy, Michael J. Cortash, Michael L. Grande
Life of this patent
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Abstract
A process for avoiding, reducing, or minimizing comet formation which comprises adding to the surface of a magnetic toner comprised of resin particles, magnetite, carbon black, optional charge additive, and wax, a surface additive mixture of silica, and magnetite.
Claims30
A process for avoiding, reducing, or minimizing comet formation which comprises adding to the surface of a magnetic toner comprised of resin particles, magnetite, carbon black, optional charge additive, and wax, a surface additive mixture of silica, and magnetite, and wherein said magnetite is a soft magnetite or an acicular magnetite.
A process for avoiding comet formation in a xerographic device that is used to prepare documents suitable for magnetic image character recognition systems which comprises adding to the surface of a magnetic toner comprised of resin particles, magnetite, carbon black, charge additive, and wax, a surface additive mixture of silica, and magnetite, and wherein said magnetite is a soft magnetite or an acicular magnetite.
A toner comprised of resin particles, first magnetite, carbon black, charge additive, wax, and a surface mixture comprised of silica, and magnetite and wherein said magnetite is a soft magnetite or an acicular magnetite.
A process for avoiding comet formation in a xerographic device that is used to prepare documents suitable for magnetic image character recognition which comprises utilizing a developer composition comprised of carrier particles and a toner comprised of styrene polymers, or polyester resin particles;
- acicular magnetite in an amount of from about 27 to about 32 weight percent;
- carbon black in an amount of from about 2 to about 3 weight percent;
- rhodamine charge additive in an amount of from about 0.7 to about 1.5 weight percent;
- low molecular weight wax, from about 1,000 to about 10,000 M.sub.w, in an amount of from about 4.5 to about 6 weight percent;
- and a surface mixture of silica in an amount of from about 0.5 to about 1 weight percent, and magnetite in an amount of from about 1 to about 5 weight percent.
A process for avoiding, reducing, or minimizing comet formation consisting essentially of adding to the surface of a magnetic toner comprised of resin particles, magnetite, carbon black, optional charge additive, and wax, a surface additive mixture of silica and magnetite, and wherein said magnetite is a soft magnetite or an acicular magnetite.
A process for avoiding comet formation in a xerographic device that is used to prepare documents suitable for magnetic image character recognition systems consisting essentially of adding to the surface of a magnetic toner comprised of resin particles, magnetite, carbon black, charge additive, and wax, a surface additive mixture of silica and magnetite, and wherein said magnetite is a soft magnetite.
Dependencies are inferred from the claim text.