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Toner particles of controlled morphology

  • US 6,482,562 B2
  • Filed: 08/31/2001
  • Issued: 11/19/2002
  • Est. Priority Date: 03/10/1999
  • Status: Expired due to Fees
First Claim
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1. 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 embedded image

    where X is H2PO4, OH, or Cl, each R1 is individually selected from the form (CH2)nY, where Y is either embedded image

    or —

    H, and R2 has the form (CH2)nZ, where Z is —

    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.

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