Back to results
US 2012/0070776 A1Published application
Emulsion aggregation toners having flow aids
AssigneeXerox Corporation
InventorsKimberly D. Nosella, Melanie Lynn Davis, Cuong Vong, Abdisamed Sheik-Qasim
Life of this patent
Estimating the term…
Abstract
The present disclosure provides processes for producing toners. In embodiments, flow aids are added to a wet cake including the toner particles, prior to drying. The addition of the flow aid improves flow characteristics of the toner, thereby enhancing overall drying time, reducing the amount of coarse particles, and improving yield, without adversely affecting fusing and charging of the toner particles.
Claims20
A process comprising:
- contacting at least one amorphous resin with at least one crystalline resin in a mixture;
- aggregating the mixture to form particles;
- coalescing the particles to form toner particles;
- washing the toner particles to form a wet cake of toner particles;
- contacting the wet cake with at least one flow aid comprising a hydrophobic metal oxide;
- drying the wet cake;
- and
- recovering the toner particles,
- wherein the toner particles possess the hydrophobic metal oxide in amounts of from about 5 ppm to about 20,000 ppm.
6 more elements
A process comprising:
- contacting at least one amorphous resin with at least one crystalline resin in a mixture;
- aggregating the mixture to form particles;
- coalescing the particles to form toner particles;
- washing the toner particles to form a wet cake of toner particles;
- contacting the wet cake with at least one flow aid comprising a hydrophobic metal oxide comprising an oxide of a metal selected from the group consisting of silicon, titanium, nickel, zirconium, silver, chromium, aluminum, cerium, zinc, strontium, beryllium, and combinations thereof;
- drying the wet cake;
- and
- recovering the toner particles,
- wherein the toner particles possess the hydrophobic metal oxide in amounts of from about 5 ppm to about 20,000 ppm.
6 more elements
A process comprising:
- contacting at least one amorphous resin with at least one crystalline resin in a mixture;
- aggregating the mixture to form particles at a temperature of from about 40° C. to about 100° C., for a time of from about 0.5 hours to about 6 hours;
- coalescing the particles to form toner particles at a temperature of from about 45° C. to about 100° C., over a period of time of from about 0.01 to about 9 hours;
- washing the toner particles to form a wet cake of toner particles;
- contacting the wet cake with at least one flow aid comprising hydrophobic silica particles having a size of from about 5 nm to about 50 nm;
- drying the wet cake;
- and
- recovering the toner particles,
- wherein the toner particles possess the hydrophobic silica in amounts of from about 5 ppm to about 20,000 ppm.
6 more elements
Dependencies are inferred from the claim text.