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Underprinting fluid compositions to improve inkjet printer image color and stability

  • US 6,450,632 B1
  • Filed: 10/12/2000
  • Issued: 09/17/2002
  • Est. Priority Date: 10/12/2000
  • Status: Expired due to Term
First Claim
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1. An inkjet ink composition comprising:

  • an aqueous solvent and at least one pigment, wherein the at least one pigment comprises macromolecular chromophores having a zeta potential of from 100 to 900 millivolts;

    and wherein, when the ink composition and an underprinting fixer fluid are mixed together to form a mixture, a portion of the at least one pigment in the ink composition precipitates out of the mixture;

    and wherein the fixer fluid comprises at least one cationic component.

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