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Ink, ink set, ink cartridge, recording unit, image recording apparatus and image recording method

  • US 6,280,513 B1
  • Filed: 03/17/1999
  • Issued: 08/28/2001
  • Est. Priority Date: 03/20/1998
  • Status: Expired due to Term
First Claim
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1. An ink for forming a print image having an optical density on a recording medium by an ink-jet method, wherein the ink comprises at least one salt selected from the group consisting of (M1)2SO4, CH3COO(M1), Ph—

  • COO(M1), (M1)NO3, (M1)Cl, (M1)Br, (M1)I, (M1)2SO3, and (M1)2CO3, wherein M1 is an alkali metal, ammonium or organic ammonium and Ph is a phenyl group, and a self dispersing carbon black; and

    wherein the concentration of the carbon black is such that the optical density of the image cannot be obtained when no salt is contained in the ink.

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