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AssigneeXerox Corporation
InventorsKurt B. Gundlach, Maura A. Sweeney, Luis A. Sanchez, Richard L. Colt, Melvin D. Croucher
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Disclosed is an ink composition which comprises water, an acid dye, a monovalent salt, a polyquaternary amine compound, and an optional nonionic or cationic surfactant, said ink being substantially free of organic solvents. The ink is particularly suitable for applications such as ink jet printing and marking pens. The disclosed inks in some embodiments are substantially indelible. Also disclosed is a composition for removing the ink compositions from substrates to which they have been applied which comprises water and a dianionic surfactant, optionally further containing a salt, urea, and/or a viscosity building agent such as a gum.
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.
An ink composition which comprises (a) water, (b) an acid dye, (c) a monovalent salt having a cation selected from the group consisting of alkali metal ions, alkaline earth ions, ammonium ions, N(CH3)4+, H3NCH2CH2NH32+, (H3C)3NCH2CH2N(CH3)32+, quaternized 1,4-diazabicyclo(2.2.2)octane, choline,
A process which comprises applying an ink composition according to claim to a substrate in an imagewise pattern.
An ink composition which comprises water, an acid dye, a monovalent salt containing anions selected from the group consisting of chloride, bromide, iodide, sulfate, acetate, propionate, hexane sulfonate, carbonate, nitrate, perchlorate, acetylacetonate, squarate, and mixtures thereof, a polyquaternary amine compound, and an optional nonionic or cationic surfactant, said ink being substantially free of organic solvents.
Dependencies are inferred from the claim text.