Liquid toner, ink composition, and methods of producing the same

  • US 5,607,808 A
  • Filed: 06/05/1996
  • Issued: 03/04/1997
  • Est. Priority Date: 03/29/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of producing a liquid toner, said method comprising the steps of:

  • dissolving a copolymer resin which is composed of at least two different monomer components in a solvent to prepare a solution;

    mixing said solution with an electrically insulating dispersion medium to carry out granulation for forming copolymer resin particles in such a relationship that a difference Δ

    δ

    1 between a solubility parameter value δ

    p1 of a homopolymer composed only of at least one monomer component in said copolymer resin and a solubility parameter value δ

    s1 of said dispersion medium is not smaller than 1.0, and that a difference Δ

    δ

    2 between a solubility parameter value δ

    p2 of a homopolymer composed only of at least one other monomer component and the solubility parameter value δ

    s1 of said dispersion medium is not larger than 1.0, and further that a difference Δ

    between Δ

    δ

    1 and Δ

    δ

    2

    δ

    1

    δ

    2) is at least 0.5; and

    removing said solvent, thereby forming copolymer resin particles each comprising a nuclear portion which is insoluble in said dispersion medium, and an outer skin portion which wraps said nuclear portion, and which is soluble or swellable in said dispersion medium.

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