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US 7,985,526 B2Granted
Supercritical fluid microencapsulation of dye into latex for improved emulsion aggregation toner
AssigneeXerox Corporation
InventorsMaura A. Sweeney, Grazyna Kmiecik-Lawrynowicz, Robert D. Bayley
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Abstract
The present disclosure provides methods for incorporating a dye into latex particles via a supercritical fluid microencapsulation technique, in order to achieve improved dispersion of a colorant in the latex and an increase in color gamut.
Claims14
A process comprising:
- polymerizing at least one monomer resin to form latex particles;
- dispersing the latex particles in de-ionized water to form a latex dispersion;
- contacting the latex dispersion with at least one dye and surfactant;
- adding a supercritical fluid and water to the latex dispersion to form a latex dye mixture;
- removing the supercritical fluid from the latex dye mixture;
- washing excess un-reacted colorant from the latex dye mixture;
- and
- recovering a resin with the colorant encapsulated therein.
5 more elements
A process comprising:
- polymerizing at least one monomer resin to form latex particles;
- dispersing the latex particles in deionized water to form a latex dispersion;
- contacting the latex dispersion with at least one dye and surfactant;
- microencapsulating the at least one colorant into the latex dispersion by adding a supercritical fluid to the latex dispersion to form a latex dye mixture;
- removing the supercritical fluid from the latex dye mixture;
- washing excess un-reacted colorant from the latex dye mixture;
- recovering a resin with the colorant encapsulated therein;
- re-dispersing the resin with encapsulated colorant in deionized water to form a resin/colorant dispersion;
- aggregating the resin/colorant dispersion with optional additives to form aggregated particles;
- coalescing the aggregated particles to form toner particles;
- and
- recovering the toner particles.
9 more elements
Dependencies are inferred from the claim text.