| abstract |
Process for preparation of toner particles for electrostatic imaging comprising (A) dispersing in a vessel at elevated temperature thermoplastic resin, nonpolar liquid and optionally a colorant, e.g., pigment, using moving particulate media, the temperature being sufficient to plasticize and liquify the resin and below the decomposition temperature of resin and/or colorant and below nonpolar liquid boiling point; (B) cooling the dispersion while maintaining continuous movement of the particulate media during and subsequent to cooling whereby toner particles are formed having an average by area particle size of less than 10 mu m and a plurality of fibers; and (C) separating the dispersion having a concentration of toner particles from the particulate media. After step (C) the dispersion can be diluted with additional nonpolar solvent and/or a charge director can be added. The dispersion having a concentration of toner particles is useful for the preparation of copies and proofs of various colors. |