Toner compositions
AssigneeXerox Corporation
InventorsDaniel W. Asarese, Grazyna E. Kmiecik-Lawrynowicz, Samir Kumar, Maura A. Sweeney, Siddhesh N. Pawar, Robert D. Bayley
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Abstract
The present disclosure provides toners and methods for their production. In embodiments, the toner may include a core/shell configuration, with a non-crosslinked resin and a crosslinked resin in the core, with a second non-crosslinked resin in the shell, pigment/pigments and a wax possessing both branched and linear carbons.
Claims20
A toner comprising a core and a shell, wherein the core comprises a resin including a first non-crosslinked polymer in combination with a crosslinked polymer, at least one modified paraffin wax possessing branched carbons in combination with linear carbons, and an optional colorant,
- wherein the shell comprises a second non-crosslinked polymer present in an amount of from about 20 percent by weight of the toner to about 40 percent by weight of the toner, and
- wherein the branched carbons of the at least one modified paraffin wax are present in an amount of from about 1% to about 20% of the wax and have a number average molecular weight of from about 520 to about 600, and the linear carbons are present in an amount of from about 80% to about 99% of the wax and have a number average molecular weight of from about 505 to about 530.
A toner comprising:
- a core and a shell, the core comprising a first non-crosslinked polymer selected from the group consisting of styrenes, acrylates, methacrylates, butadienes, isoprenes, acrylic acids, methacrylic acids, acrylonitriles, and combinations thereof, in combination with a crosslinked polymer, at least one modified paraffin wax possessing branched carbons in combination with linear carbons, and an optional colorant,
- wherein the shell comprises a second non-crosslinked polymer selected from the group consisting of styrenes, acrylates, methacrylates, butadienes, isoprenes, acrylic acids, methacrylic acids, acrylonitriles, and combinations thereof, present in an amount of from about 26 percent by weight of the toner to about 36 percent by weight of the toner,
- wherein, the branched carbons are present in an amount of from about 1% to about 20% of the wax and have a number average molecular weight of from about 520 to about 600, and the linear carbons are present in an amount of from about 80% to about 99% of the wax and have a number average molecular weight of from about 505 to about 530,
- and wherein particles comprising the toner possess a circularity of from about 0.950 to about 0.998.
- and wherein particles comprising the toner possess a surface area from about 0.5 m2/g to about 1.4 m2/g.
A process comprising:
- contacting an emulsion comprising a first non-crosslinked polymer in combination with a crosslinked polymer, at least one modified paraffin wax possessing branched carbons in combination with linear carbons, and an optional colorant;
- aggregating the particles by contacting the particles with from about 0.1 parts per hundred to about 0.25 parts per hundred of an aggregating agent to form aggregated particles;
- forming a shell over the aggregated particles by contacting the aggregated particles with an emulsion comprising a second non-crosslinked polymer;
- and
- recovering the toner particles,
- wherein the toner particles possess a circularity of from about 0.900 to about 0.999.
Dependencies are inferred from the claim text.