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Pigmented inks and a method of making pigmented inks

  • US 6,478,862 B1
  • Filed: 03/14/2000
  • Issued: 11/12/2002
  • Est. Priority Date: 03/14/2000
  • Status: Expired due to Term
First Claim
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1. An ink jet ink comprising:

  • a) water;

    b) pigment;

    c) water miscible organic solvent;

    d) high-boiling water miscible organic solvent;

    e) optionally, a biocide; and

    f) optionally a photoinitiator;

    wherein said ink does not contain ethylene glycol or diethylene glycol;

    wherein the concentration of the water miscible organic solvent and the high boiling water miscible organic solvent together is from about 20% to about 50% by weight, based upon the total weight of the ink;

    wherein the surface tension of the ink is from 30 to 74 dyne-cm;

    wherein the liquid conductivity of the ink is less than about 5 milli-mhos;

    wherein the pigment has a nominal particle size of less than about 0.2 microns; and

    wherein the ink has a pH of from about 7 to about 10.

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