Patent ID: 7445879
Filing Date: 2008-11-04
Classification: G03G

Abstract:
1. A process for the preparation of a dry toner powder from an aqueous pigment concentrate dispersion, the process comprising: a) blending at least an aqueous-based pigment concentrate dispersion, an optional aqueous wax dispersion and a resin mixture to produce a paste; b) charging the paste to an extruder and compounding the paste at a temperature of up to about 150° C. to generate an extruded pigment/resin mixture; c) dispersing the extruded pigment/resin mixture in a vinyl monomer mixture to create an organic phase wherein the resin is solublized; d) dispersing the organic phase in an aqueous phase containing a stabilizer, and mixing the organic phase and the aqueous phase under shear force to form an suspension of toner size droplets; e) heating the suspension to polymerize the vinyl monomers and form toner particles; f) washing, drying, and collecting the particles for use as a dry toner powder.