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Ink compositions substantially free of organic liquids

  • US 6,258,873 B1
  • Filed: 06/29/1998
  • Issued: 07/10/2001
  • Est. Priority Date: 03/24/1998
  • Status: Expired due to Term
First Claim
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1. An ink composition which comprises (a) water, (b) an acid dye, (c) a monovalent salt, (d) a polyquaternary amine compound selected from the group consisting of polydiallyl ammonium compounds, polyquaternized polyvinylamines, polyquaternized polyallylamines, epichlorohydrin/amine copolymers, cationic amido amine copolymers, copolymers of vinyl pyrrolidinone and a vinyl imidazolium salt containing at least about 50 percent vinyl imidazolium salt monomers, and mixtures thereof, and (e) an optional nonionic or cationic surfactant, said ink being substantially free of organic solvents.

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