Patent ID: 6130021
Filing Date: 2000-10-10
Classification: G03G

Abstract:
A process for the preparation of toner comprising blending a latex emulsion containing resin, with a colorant and from 2 to 30 weight percent of a hydroresin based on the total amount of the latex resin and the hydroresin; adding an acid to achieve a pH of about 2 to about 4 for the resulting mixture; heating at a temperature about equal to, or below about the glass transition temperature (Tg) of the latex resin; optionally adding an ionic surfactant stabilizer; heating at a temperature about equal to, or above about the Tg of the latex resin; and optionally cooling, isolating, washing, and drying the toner, and wherein the blend of the latex emulsion containing resin, and the colorant and hydroresin, possesses a pH of about 4.5 to about 6, the colorant is in the form of an aqueous dispersion, the heating and stirring the resulting mixture at a temperature about equal to, or below about the glass transition temperature (Tg) of the latex resin enables the formation of toner sized aggregates; the heating at a temperature about equal to, or above about the Tg of the latex resin enables the fusion or coalescence of the components of aggregates.