×

Toner composition with semi-crystalline polyester wax and method of preparation

  • US 5,298,355 A
  • Filed: 11/13/1992
  • Issued: 03/29/1994
  • Est. Priority Date: 11/13/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for the preparation of electrostatographic toner comprising the steps of:

  • (a) dissolving at ambient temperature a low melting point hydrophobic semi-crystalline polyester wax in a first solvent capable of dissolving the wax at ambient temperature, thereby forming a solution;

    (b) forming a pigment dispersion at ambient temperature by mixing a pigment, a first polymer material and a second solvent in which the hydrophobic wax is insoluble at ambient temperature;

    (c) admixing the wax solution with the pigment dispersion so resulting in precipitation of the wax upon the surface of the pigment;

    (d) mixing the wax coated pigment dispersion thus formed with a solvent in which the hydrophobic wax is insoluble at ambient temperature, and optionally, a second polymer material and, optionally, a charge-control agent to form an organic phase;

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

    (f) evaporating the solvent and washing and drying the resultant product.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×