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Toner for developing electrostatic latent images

  • US 5,476,744 A
  • Filed: 06/15/1994
  • Issued: 12/19/1995
  • Est. Priority Date: 11/11/1991
  • Status: Expired due to Term
First Claim
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1. A production method of a toner for developing an electrostatic latent image formed on an electrostatic latent image-retaining member comprising:

  • a first step of passing a toner composition-dispersed phase comprising a thermoplastic resin dissolved or dispersed in an organic solvent through a microporous body to form a homogeneous emulsion in a continuous phase of an aqueous solution, said microporous body having penetrated pores with an uniformity in the pore diameter distribution;

    a mechanical strength sufficient to resist deformation by the passed dispersed phase;

    a chemical inertness to the dispersed phase, the continuous phase and toner composition; and

    a higher wettability to the liquid of the continuous phase than the liquid of the dispersed phase;

    a second step of removing the organic solvent from the toner composition-dispersed phase and obtaining toner particles dispersed in the aqueous solution; and

    a third step of removing the aqueous solution and obtaining toner particles.

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