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Method for the preparation of electrostatographic toner of controlled shape by evaporative limited coalescence

  • US 5,283,151 A
  • Filed: 05/28/1992
  • Issued: 02/01/1994
  • Est. Priority Date: 05/28/1992
  • Status: Expired due to Term
First Claim
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1. A method for the preparation of electrostatographic toner comprising the steps of:

  • (a) mixing carnauba wax in a first solvent heated to a temperature sufficient to dissolve the wax and cooling the resultant solution, so resulting in the precipitation of the wax in the form of fine needle-like structures;

    (b) mixing the wax needles with a polymer material, a pigment, a second solvent and optionally a charge control agent to form an organic phase;

    (c) dispersing the organic phase in an aqueous phase comprising a promoter and a particulate stabilizer and homogenizing the resultant mixture; and

    (d) evaporating the second solvent and washing and drying the resultant product.

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