Passivated toner compositions comprising positive charge enhancing additive
AssigneeXerox Corporation
InventorsRoger N. Ciccarelli, Denise R. Bayley
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Abstract
A process for the preparation of passivated toners with a substantially stable positive or negative triboelectric value of from about 10 to about 30 microscoulombs per gram which comprises admixing toner resin particles, colored pigment particles, and a charge enhancing additive; and subsequently adding thereto surface additives wherein the charge additive functions primarily as a passivating component.
Claims20
A process for the preparation of toner compositions consisting essentially of admixing toner resin particles, colored negatively charged pigment particles selected from the group consisting of red and blue, and a positive charge enhancing additive selected from the group consisting of cetyl pyridinium chloride and distearyl dimethyl ammonium methyl sulfate;
- and subsequently adding thereto surface additives thereby enabling passivation of said pigment particles and wherein there is minimal or no adverse effects on the toner compositions triboelectric characteristics by said pigment particles.
An imaging process which comprises (1) charging an imaging member in an imaging apparatus;
- (2) creating on the member a latent image comprising areas of high, intermediate, and low potential;
- (3) developing the low areas of potential with a first developer comprising carrier and a toner, which toner is prepared by admixing toner resin particles, colored negatively charged pigment particles selected from the group consisting of red and blue, and a positive charge enhancing additive selected from the group consisting of cetyl pyridinium chloride and distearyl dimethyl ammonium methyl sulfate;
- and subsequently adding thereto surface additives thereby enabling passivation of said pigment particles and wherein there is minimal or no adverse effects on the toner composition triboelectric characteristics by said pigment particles;
- (4) developing the high areas of potential with a second developer comprising carrier and a second toner comprised of resin, pigment, and a charge enhancing additive;
- (5) transferring the resulting developed image to a substrate;
- and (6) fixing the image thereto.
Dependencies are inferred from the claim text.