Patent ID: 6482562
Filing Date: 2002-11-19
Classification: G03G

Abstract:
A method for the preparation of electrostatographic toner comprising the steps of:A) dissolving a polymer material in an organic solvent to form an organic phase; B) dispersing the organic phase in an aqueous phase comprising a flocculating agent and a particulate stabilizer to form a dispersion and homogenizing the resultant dispersion, wherein the particulate stabilizer is selected from the group consisting of highly cross-linked latex polymeric material, and SiO2 and wherein flocculating agent is a cationic compound that is an ammonium salt having the general form â€ƒwhere X is H2PO4, OH, or Cl, each R1 is individually selected from the form (CH2)nY, where Y is either â€ƒor â€”H, and R2 has the form (CH2)nZ, where Z is â€”NHOOC(CH2)pCH3, each n is individually selected from the integers ranging from 0 to 5, and each p is individually selected from an integer from 0 to 20; or said cationic flocculating agent is a product of condensation polymerization between one or more dicarboxylic acids and an aminoalcohol, diamine, or diol, wherein at least one group contained in an organic dicarboxylic acid chain carries a positive charge, thereby forming dispersed particles, and C) evaporating the organic solvent from the dispersed particles formed in step (B) and recovering resultant product.