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US 8,133,649 B2Granted
Toner compositions
AssigneeXerox Corporation
InventorsMaria N. V. McDougall, Ke Zhou, Edward G. Zwartz, Daryl W. Vanbesien, John L. Pawlak, Paul J. Gerroir, Suxia Yang, Richard P. N. Veregin, Karen Ann Moffat
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Abstract
Toner particles are provided which may, in embodiments, include a high molecular weight branched or cross-linked polyester to decrease image gloss and to increase toner elasticity to prevent surface additives impaction. In embodiments, the toner particles may have a core-shell configuration, with the high molecular weight polyester in the core, the shell, or both.
Claims20
A toner comprising:
- at least one linear polyester;
- at least one crystalline polyester;
- and
- at least one branched high molecular weight polyester having a Mw greater than about 15,000 and a polydispersity index of greater than about 4,
- wherein the linear polyester and the high molecular weight polyester have a difference in solubility parameter of from about 0.1 to about 1,
- wherein at least a portion of the branched polyester is located on the surface as particles having a diameter of from about 100 nanometers to about 300 nanometers, and wherein the particles cover from about 10% to about 90% of the toner surface.
3 more elements
A toner comprising:
- at least one linear polyester;
- at least one crystalline polyester;
- and
- at least one high molecular weight polyester having a Mw greater than about 15,000 and a polydispersity index of greater than about 4,
- wherein the linear polyester and the high molecular weight polyester have a difference in solubility parameter of from about 0.1 to about 1,
- wherein the at least one linear resin comprises a poly(propoxylated bisphenol A co-fumarate) resin of the formula:
- wherein m is from about 5 to about 1000,
- wherein the at least one crystalline resin is of the formula:
- wherein b is from 5 to 2000 and d is from 5 to 2000.
6 more elements
A process comprising:
- contacting at least one linear resin with at least one crystalline polyester resin in an emulsion comprising at least one surfactant;
- contacting the emulsion with at least one high molecular weight polyester having a Mw greater than about 15,000 and a polydispersity index of greater than about 4, wherein the linear polyester and the high molecular weight polyester have a difference in solubility parameter of from about 0.1 to about 1, an optional colorant, and an optional wax;
- aggregating the small particles to form a plurality of larger aggregates;
- coalescing the larger aggregates to form particles;
- and
- recovering the particles,
- wherein the high molecular weight polyester is branched, wherein at least a portion of the branched polyester is located on the surface as particles having a diameter of from about 100 nanometers to about 300 nanometers, and wherein the particles cover from about 10% to about 90% of the toner surface.
4 more elements
Dependencies are inferred from the claim text.