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Preparation of permanent color inks from water-soluble colorants using specific phosphonium salts

  • US 6,248,161 B1
  • Filed: 01/11/1999
  • Issued: 06/19/2001
  • Est. Priority Date: 01/11/1999
  • Status: Expired due to Term
First Claim
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1. A water-fast, dye-based, aqueous ink-jet which contains at least one anionic dye, said ink-jet further containing an amount of at least one water-fast phosphonium salt, the amount effective to improve color permanence of the ink, the at least one water-fast phosphonium salt having a chain of at least 5 carbon atoms, and wherein said ink further contains at least one additional cationic salt selected from the group consisting of )a) non-water-fast phosponium salts, (b) cationic salts, (c) catonic polymers, and (d) polyfunctional cationic salts, said at least one cationic salt partially replacing said at least one water-fast phosphonium salt to thereby improve aqueous dispersion stability and printability.

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