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Water-based pigment ink, and ink-jet recording method and instruments using the same

  • US 5,976,233 A
  • Filed: 11/10/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 11/13/1996
  • Status: Expired due to Term
First Claim
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1. A water-based pigment ink comprising a coloring material composed of self-dispersing carbon black obtained by bonding at least one hydrophilic group through another atomic group to the surface of carbon black, a humectant of the general formula


  • space="preserve" listing-type="equation">H--(CH.sub.2).sub.m --C--((CH.sub.2).sub.n OH).sub.3
wherein m and n are independently an integer of 1 to 5, and an aqueous medium composed of water and a water-soluble organic solvent.

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