Xerox Corporation

Geoffrey A Nobes

Marcel Philippe Breton

Shadi L Malhotra

Kurt B Gundlach

Richard L Colt

Barbel Helbrecht

Disclosed is an ink composition consisting essentially of water, a colorant, an organic component miscible with water, and micelles which comprise an ethoxylated alcohol. Also disclosed is a process for preparing an aqueous ink composition which comprises (a) admixing an ethoxylated alcohol with a water-miscible organic liquid at a temperature at or above the melting point of the ethoxylated alcohol to prepare a saturated solution of the ethoxylated alcohol in the organic liquid; (b) cooling the solution thus formed, thereby obtaining a solid solution with a melting point of from about 30.degree. to about 80.degree. C.; (c) admixing the saturated solution thus prepared with a mixture containing water and a water soluble dye at a temperature equal to or higher than the melting point of the ethoxylated alcohol solution, thereby resulting in an ink composition containing micelles which comprise the ethoxylated alcohol. Further disclosed is an ink jet printing process which comprises incorporating into an ink jet printing apparatus an ink composition which comprises water, a colorant, an organic component miscible with water, and micelles which comprise an ethoxylated alcohol, and causing droplets of the ink composition to be ejected in an imagewise pattern onto a substrate.

Micellar-based ink compositions

Disclosed is an ink composition which comprises water, an anionic dye, and a compound selected from the group consisting of N,N'-bis(3-aminopropyl)-1,2-ethylenediamine, 1,4-bis(3-aminopropyl)piperazine, N,N'-bis(3-aminopropyl)-1,3-propanediamine, N,N'-bis(2-amionethyl)-1,3-propanediamine, N,N'-bis(3-aminopropyl)-1,4-butanediamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, nitrilotrisethylamine, N,N'-(diaminoethyl)piperazine, piperazinylethylethylenediamine, aminoethyltriethylenetetramine, aminoethylpiperazinylethylethylenediamine, piperazinylethyldiethylenetriamine, pentaethylene hexamine and mixtures thereof, said ink composition having a pH of more than about 8 and less than about 9. Further disclosed is an ink composition comprises water, a dye, a polyamine compound, and a monoamine compound of the general formula ##STR1## wherein R.sup.1, R.sup.2, and R.sup.3 are independently selected from the group consisting of hydrogen, alkyl, and substituted alkyl. In one embodiment, the polyamine compound is a first generation dendrimer compound having terminal primary amine groups.

Ink compositions

Disclosed is an ink composition which comprises an aqueous liquid vehicle, a colorant, and an additive material selected from the group consisting of amine alkoxylates, sorbitan monoester alkoxylates, alkylene oxide adducts of glycerine, and mixtures thereof.

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Kitchener, Canada

Geoffrey A Nobes