Toner processes

Details Toner processes Toner processes

G - Physics

03

G

G03G 9/12 (2006.01) G03G 9/08 (2006.01) G03G 9/13 (2006.01)

Patent

CA 2112988

A process for the preparation of toner compositions comprising (i) preparing a pigment dispersion in a solvent, which dispersion is comprised of a pigment, an ionic surfactant and optionally a charge control agent; (ii) shearing the pigment dispersion with a latex mixture comprised of a counterionic surfactant with a charge polarity of opposite sign to that of said ionic surfactant, a nonionic surfactant and resin particles, thereby causing a flocculation or heterocoagulation of the formed particles of pigment, resin and charge control agent to form electrostatically bound toner size aggregates; and (iii) heating the statically bound aggregated particles to form said toner composition comprised of polymeric resin, pigment and optionally a charge control agent.

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