Toner aggregation processes

Abstract From the Canadian patent

A process for the preparation of toner compositions comprising: (i) preparing a pigment dispersion, which dispersion is comprised of a pigment, an ionic surfactant and optionally a charge, control agent; (ii) shearing said pigment dispersion with a latex or emulsion blend comprised of resin, a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant and a nonionic surfactant; (iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound, toner size aggregates with a narrow particle size distribution; and (iv) heating said bound aggregates above about the Tg of the resin.