Patent ID: 8530131
Filing Date: 2013-09-10
Classification: G03G

Abstract:
1. A process for preparing emulsion aggregation toner particles comprising: contacting at least one amorphous resin with at least one crystalline resin in a dispersion comprising at least one surfactant; contacting the dispersion with an optional colorant, at least one surfactant, and an optional wax to form core particles; aggregating the core particles to form aggregated core particles; contacting the aggregated core particles with a shell resin comprising from about 5 wt % to about 35 wt % of a batch prepared polyester gel comprising at least one amorphous resin selected from the group consisting of poly(propoxylated bisphenol co-fumarate), poly(ethoxylated bisphenol co-fumarate), poly(butyloxylated bisphenol co-fumarate), poly(co-propoxylated bisphenol co-ethoxylated bisphenol co-fumarate), poly(,2-propylene fumarate), poly(propoxylated bisphenol co-maleate), poly(ethoxylated bisphenol co-maleate), poly(butyloxylated bisphenol co-maleate), poly(co-propoxylated bisphenol co-ethoxylated bisphenol co-maleate), poly propylene maleate), poly(propoxylated bisphenol co-itaconate), poly(ethoxylated bisphenol co-itaconate), poly(butyloxylated bisphenol co-itaconate), poly(co-propoxylated bisphenol co-ethoxylated bisphenol co-itaconate), poly(1,2-propylene itaconate), and combinations thereof, to form core/shell particles comprising a core encapsulated by a shell; coalescing the core/shell particles at a temperature from about 40° C. to about 99° C. to form the toner particles; and recovering the toner particles, wherein the shell of the core/shell particles comprises a viscosity greater than the viscosity of the core; wherein the toner particles exhibit a viscosity plateau at higher temperatures as compared to toner particles without the polyester gel in the shell; and, wherein gloss of the toner particles is from about 20 ggu to about 10 ggu.