Acrylonitrile-modified toner composition and processes
AssigneeXerox Corporation
InventorsBeng S. Ong, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, Walter Mychajlowskij, David J. Sanders, T. Hwee Ng
Life of this patent
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Abstract
A toner comprised of pigment, and an addition polymer resin generated from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid.
Claims13
A process for the preparation of toner consisting essentially of:
- (i) preparing in the presence of an ionic surfactant and an optional nonionic surfactant a latex emulsion generated from the emulsion polymerization of a mixture of from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid;
- (ii) mixing said latex emulsion by high shear blending with an aqueous pigment dispersion comprised of pigment and an ionic surfactant that is of opposite charge polarity to the ionic surfactant in said latex emulsion;
- (iii) heating the resultant flocculent mixture at a temperature that is about 30.degree. C. below to about 10.degree. C. above the Tg of the latex resin to form electrostatically bound toner sized aggregates;
- (iv) subsequently heating said aggregate suspension at a temperature of from about 10.degree. C. to about 50.degree. C. above the Tg of the latex resin;
- and optionally
- (v) followed by washing, drying, and dry blending the toner with surface additives.
A process for the preparation of toner comprising mixing an aqueous colorant dispersion with a latex emulsion containing an ionic surfactant, wherein said colorant dispersion is comprised of colorant and an ionic surfactant that is of opposite charge polarity to the ionic surfactant in said latex emulsion;
- and wherein said latex emulsion is generated from the emulsion polymerization of a mixture of from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid, and which polymerization is accomplished in the presence of an ionic surfactant and an optional nonionic surfactant;
- heating the resultant mixture at a temperature that is about 30.degree. C. below to about 10.degree. C. above the Tg of the latex resin to form toner aggregates;
- subsequently heating said aggregates at a temperature of from about 10.degree. C. to about 50.degree. C. above the Tg of the latex resin;
- and optionally followed by washing, drying, and dry-blending the toner with surface additives.
A process for the preparation of toner consisting of:
- (i) preparing in the presence of an ionic surfactant and an optional nonionic surfactant a latex emulsion containing an ionic surfactant generated from the emulsion polymerization of a mixture of from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid;
- (ii) mixing said latex emulsion by high shear blending with an aqueous colorant dispersion comprised of colorant and an ionic surfactant that is of opposite charge polarity to the ionic surfactant in said latex emulsion;
- (iii) heating the resultant flocculent mixture at a temperature that is about 30.degree. C. below to about 10.degree. C. above the Tg of the latex resin to form electrostatically bound toner sized aggregates;
- (iv) subsequently heating said aggregate suspension at a temperature of from about 10.degree. C. to about 50.degree. C. above the Tg of the latex resin;
- (v) followed by washing, drying, and dry blending the toner with surface additives.
Dependencies are inferred from the claim text.