Patent ID: 8367294

Claim:
A toner process consisting of: aggregating a latex emulsion containing a first resin selected from the group consisting of poly(styrene-butadiene), poly(methylstyrene-butadiene), poly(methyl methacrylate-butadiene), poly(ethyl methacrylate-butadiene), poly(propyl methacrylate-butadiene), poly(butyl methacrylate-butadiene), poly(methyl acrylate-butadiene), poly(ethyl acrylate-butadiene), poly(propyl acrylate-butadiene), poly(butyl acrylate-butadiene), poly(styrene-isoprene), poly(methylstyrene-isopropene), poly(methyl methacrylate-isopropene), poly(ethyl methacrylate-isoprene), poly(propyl methacrylate-isoprene), poly(butyl methacrylate-isoprene), poly(methyl acrylate-isoprene), poly(ethyl acrylate-isoprene), poly(propyl acrylate-isoprene), poly(butyl acrylate-isoprene); poly(styrene-propyl acrylate), poly(styrene-butyl acrylate), poly(styrene-butadiene-acrylic acid), poly(styrene-butadiene-methacrylic acid), polystyrene-butadiene-acrylonitrile-acrylic acid), poly(styrene-butyl acrylate-acrylic acid), poly(styrene-butyl acrylate-methacrylic acid), poly(styrene-butyl acrylate-acrylonitrile), polyesters, and poly(styrene-butyl acrylate-acrylonitrile-acrylic acid), and combinations thereof, with at least one stabilizer of the following formula where R 1 is hydrogen or a methyl group, R 2 and R 3 are independently selected from alkyl groups containing from about 1 to about 12 carbon atoms or a phenyl group, and n is from about 0 to about 20, with a colorant, at least one surfactant, and an optional wax to form small particles; adding to the particles obtained a buffer system having a pH of from about 5 to about 6.5 and which buffer system consists of a mixture at an acid, a salt, and optionally deionized water, wherein the acid is selected from the group consisting of acetic acid, glacial acetic acid, citric acid, formic acid, oxalic acid, phthalic acid, salicylic acid, and mixtures thereof, and the salt is selected from the group consisting of sodium acetate, sodium acetate trihydrate, potassium acetate, zinc acetate, sodium hydrogen phosphate, potassium formate, sodium oxalate, sodium phthalate, potassium salicylate, and mixtures thereof; adding a second emulsion containing a second resin; coalescing the resulting aggregated particles to form toner particles; and recovering the toner particles, wherein less than about 4% of the toner particles generated have a diameter greater than about 25 microns, and wherein said toner consists of a core of at least one of said first resins and a shell of said second resin.