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US 2012/0258398 A1Published application
Toner compositions and processes
AssigneeXerox Corporation
InventorsKe Zhou, Daryl W. Vanbesien, Jordan H. Wosnick, Karen Ann Moffat
Life of this patent
Estimating the term…
Abstract
Toners are provided, which possess low melt properties capable of producing a low gloss finish. Methods for providing these resins and toners are also provided which include the process of controlling the gloss of the toner utilizing a slow acid addition during coalescence optionally combined with little or no chelating agent added during the aggregation process.
Claims20
A process comprising:
- contacting at least one amorphous resin with at least one crystalline resin and optionally one styrene/acrylate gel in a mixture;
- aggregating the mixture to form particles;
- adding a buffer having a pH of from about 3 to about 7 to the particles by metered addition to reach a desired pH over a period of from about 0.25 hours to about 10 hours;
- and
- coalescing the particles to form toner particles.
2 more elements
A process comprising:
- contacting at least one amorphous resin with at least one crystalline resin and optionally one styrene/acrylate gel in a mixture;
- aggregating the mixture to form core particles;
- contacting the core particles with an emulsion comprising at least one amorphous resin to form a shell over the particles;
- slowly adding a buffer drop wise to the particles to reach a desired pH at a rate of from about 0.1 grams/minute per 100 grams of dry toner to about 5 grams/minute per 100 grams of dry toner;
- and
- coalescing the particles to form toner particles.
3 more elements
A process comprising:
- contacting at least one amorphous resin with at least one crystalline resin and optionally one styrene/acrylate gel in a mixture;
- aggregating the mixture to form core particles;
- contacting the core particles with an emulsion comprising at least one amorphous resin to form a shell over the particles;
- slowly adding a buffer system drop wise to the particles to reach a desired pH from about 4 to about 7, at a rate of from about 0.1 grams/minute per 100 grams of dry toner to about 5 grams/minute per 100 grams of dry toner;
- and
- coalescing the particles to form toner particles.
3 more elements
Dependencies are inferred from the claim text.