Toner and developer compositions with surface additives
AssigneeXerox Corporation
InventorsFrancoise M. Winnik, William Riske, Anthony R. Davidson, Paul J. Gerroir, Richard P. N. Veregin
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Abstract
A toner composition comprised of resin particles, pigment particles, an optional charge enhancing additive component, or components, and a surface additive, or additives comprised of a metal oxide containing a coating thereover of a surfactant.
Claims33
A toner composition consisting essentially of resin particles, pigment particles, an optional charge enhancing additive component, or components, and a surface additive, or additives comprised of a metal oxide containing a coating thereover of a surfactant;
- and wherein said additives have a particle diameter of from about 4 to about 100 nanometers, and which additives are prepared by mixing said surfactant and an organic solvent immiscible with water to form a stable microemulsion with water;
- adding to the mixture formed a solution of a hydrolyzing reagent and water to form a microemulsion of water domains within a continuous phase of the organic solvent;
- and adding to the microemulsion an oil soluble metal oxide precursor which reacts with the hydrolyzing agent to form in the water domains a metal oxide coated with said surfactant, and wherein said toner particles possess improved flow characteristics and which toner particles have triboelectric characteristics substantially independent of the relative humidity.
A toner composition consisting essentially of resin, and pigment, a charge additive comprised of distearyl methyl hydrogen ammonium bisulfate, trimethyl hydrogen ammonium bisulfate, triethyl hydrogen ammonium bisulfate, tributyl hydrogen ammonium bisulfate, didodecyl methyl hydrogen ammonium bisulfate, dihexadecyl methyl hydrogen ammonium bisulfate, or mixtures thereof, and a surface additive comprised of a hydrophobic metal oxide with a coating thereover of a surfactant, and wherein the surface additive particles have a diameter of from between about 4 to about 100 nanometers;
- and wherein said additives have a particle diameter of from about 4 to about 100 nanometers, and which additives are prepared by mixing said surfactant and an organic solvent immiscible with water to form a stable microemulsion with water;
- adding to the mixture formed a solution of a hydrolyzing reagent and water to form a microemulsion of water domains within a continuous phase of the organic solvent;
- and adding to the microemulsion an oil soluble metal oxide precursor which reacts with the hydrolyzing agent to form in the water domains a metal oxide coated with said surfactant, and wherein said toner particles possess improved flow characteristics and which toner particles have triboelectric characteristics substantially independent of the relative humidity.
Dependencies are inferred from the claim text.