Patent attributes
The invention relates to color toner compositions prepared from a process for the preparation of a dry toner powder from an aqueous pigment concentrate dispersion comprising: blending at least an aqueous-based pigment concentrate dispersion and a resin to produce a paste; charging the paste to an extruder to generate an extruded pigment/resin mixture; dispersing the extruded pigment/resin mixture in a low boiling organic medium to create an organic phase; dispersing the organic phase in an aqueous phase containing a particulate stabilizer 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; removing the organic solvent and particulate stabilizer from the formed particles; and washing, drying, and collecting the particles for use as a dry toner powder.
