Patent ID: 7521166

Claim:
A process for preparing a toner for electrophotography comprising a resin binder and a colorant, comprising the steps of: (1) forming primary particles comprising the resin binder and the colorant in an aqueous medium in the presence of a nonionic surfactant; and (2) aggregating the primary particles, and unifying the aggregated particles, wherein at least one of the following conditions (a) and (b) apply: (a) the primary particles are obtained from the resin binder and a masterbatch of the colorant dispersed in a resin, the colorant has an average particle size of from 5 to 100 nm, and the primary particles in the step (1) have an average particle size of from 0.05 to 3 μm, the average particle size of the colorant being smaller than that of the primary particles; (b) the step (1) comprises the step of adding an aqueous medium to a mixture comprising at least the resin binder, the colorant, and the nonionic surfactant, wherein the aqueous medium is added in an amount of from 0.1 to 50 g/min per 100 g of the mixture.