Patent ID: 7247416

Claim:
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 and a resin 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 with a greater degree of dispersion than was present in the paste; c. dispersing the extruded pigment/resin mixture in a low boiling organic medium to create an organic phase; d. dispersing the organic phase in an aqueous phase containing a particulate stabilizer and optionally an interface promoter and mixing the organic phase and the aqueous phase at elevated temperature and under shear force to form toner particles of a controlled size and shape; e. removing the organic solvent, particulate stabilizer, and interface promoter, if used, from the formed particles; and f. washing, drying, and collecting the particles for use as a dry toner powder.