Processes for custom color encapsulated toner compositions
AssigneeXerox Corporation
InventorsAnthony J. Paine, Trevor I. Martin, Lurdes M. Martins, Karen A. Moffat, Walter Mychajlowskij
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Abstract
A process for obtaining custom color toner compositions which comprises admixing at least two encapsulated toners wherein each toner is comprised of a core comprised of a polymer binder, pigment, dye, or mixtures thereof, and a polymeric shell; and wherein the pigment, dye, or mixtures thereof is different for each toner, thereby resulting in a toner with a color different than each of said encapsulated toners.
Claims32
A process for obtaining custom color toner compositions which comprises admixing at least two encapsulated toners wherein each toner is comprised of a core comprised of a polymer binder, pigment, dye, or mixtures thereof, and a polymeric shell prepared by interfacial polycondensation polymerization;
- and wherein the pigment, dye or mixtures thereof is different for each toner, thereby resulting in a custom color toner with a color different than each of said encapsulated toners, and containing an effective proportion of intact polymeric shells which results in the triboelectric charge on the custom color toner being substantially equal to the triboelectric charge on the encapsulated toners.
A process for preparing passivated custom color toner compositions which comprises (1) preparing a first core material which comprises first pigment particles and core monomer and optional polymer components, and preparing a second core material which comprises second pigment particles and core monomer and optional polymer components, said second pigment particles being of a different color from that of the first pigment particles;
- (2) dispersing the core materials into an aqueous phase containing a surfactant or emulsifier;
- (3) encapsulating said first core material and said second core material within polymeric shells by interfacial polymerization reactions between at least two shell monomers, wherein the first shell monomer is soluble in organic media and the second shell monomer is soluble in aqueous media;
- (4) polymerizing the core monomers via free radical polymerization at a temperature of from about 50.degree. C. to about 130.degree. C. for about 8 hours to about 24 hours;
- (5) thereafter washing the toner thus formed to remove the stabilizing materials;
- (6) subsequently drying the final toner product, thereby producing two encapsulated heat fusible toner compositions of different colors and having similar triboelectric charging characteristics;
- and (7) admixing the formed two encapsulated toners thereby resulting in a custom color toner with a color different than each of said encapsulated toners, and containing an effective proportion of intact polymeric shells which results in the triboelectric charge on the custom color toner being substantially equal to the triboelectric charge on the encapsulated toners.
Dependencies are inferred from the claim text.