Xerox Corporation

Edward J Radigan

Louis V Isganitis

Kurt B Gundlach

William M Schwarz

Richard L Colt

Arthur M Gooray

Leonard M Carreira

Beng S Ong

Raj D Patel

Grazyna E Kmiecik-Lawrynowicz

Robert D Bayley

Michael A Hopper

Thomas R Hoffend

Bernard Grushkin

Kenneth C Peter

Robert N Jones

Garland J Nichols

Susan Robinette

Julia A Kohlmeier

Warren E Solodar

Miguel A Fontanez

David E Hutka

An ink for ink jet printing includes a liquid vehicle comprising water and toner particles with a colorant dispersed in or associated with the toner particles. The ink composition combines the print quality advantages of xerographic printing with the economic advantages of ink jet printing, thereby providing waterfast, archival quality prints.

Ink jet inks containing toner particles as colorants

Disclosed is a printing process which comprises applying in imagewise fashion to a substrate an ink composition which comprises an aqueous liquid vehicle, a colorant, and a drying component selected from the group consisting of zwitterionic compounds, and subsequently exposing the substrate to microwave radiation, thereby drying the images on the substrate. In a preferred embodiment, the invention is directed to a thermal ink jet printing process which comprises (1) incorporating into a thermal ink jet printing apparatus an ink composition which comprises an aqueous liquid vehicle, a colorant, and a drying component selected from the group consisting of zwitterionic compounds; (2) heating the ink in an imagewise pattern to cause bubbles to form therein, thereby causing droplets of the ink to be ejected in an imagewise pattern onto a substrate, thereby generating images on the substrate; and (3) exposing the substrate to microwave radiation, thereby drying the images on the substrate.

Ink jet printing processes with microwave drying

Disclosed are ink compositions comprising water, a colorant, and a phosphite salt of the general formula ##STR1## wherein R, R', R' and R'' can each, independently of each other, be hydrogen, an alkyl group, a substituted alkyl group, an aryl group, or a substituted aryl group. Also disclosed is a process for preparing an ink composition which comprises admixing water, a colorant, a base, and an acid selected from the group consisting of hypophosphoric acid, hypophosphorous acid, alkyl phosphonic acids, aryl phosphonic acids, alkyl phosphinic acids, aryl phosphinic acids, and mixtures thereof, wherein the pH of the ink is adjusted by a process selected from the group consisting of (a) adding the acid to an aqueous solution containing the base, and (b) adding the base to an aqueous solution containing the acid. Further disclosed are ink compositions comprising water, a colorant, and a salt selected from the group consisting of hypophosphate salts, hypophosphite salts, alkyl phosphite salts, aryl phosphite salts, alkyl phosphonite salts, aryl phosphonite salts, and mixtures thereof.

Ink compositions for ink jet printing

Disclosed is a process for preparing an aqueous ink composition which comprises adjusting the pH of the ink with phosphorous acid or phosphite salts. Also disclosed are ink compositions prepared by this process. In certain preferred embodiments, the ink compositions can also contain betaine, sulfolane, dimethyl sulfoxide, or N,N'-bis(3-aminopropyl)-1,2-ethylenediamine, as well as mixtures thereof. In other preferred embodiments, the ink composition comprises an organic component selected from the group consisting of sulfolane, dimethyl sulfoxide, and mixtures thereof, and anions selected from the group consisting of phosphite, hypophosphite, phosphate, polyphosphate, sulfate, hexafluorophosphate, glycolate, acetate, ethylenediaminetetraacetate, formate, borate, sulfite, sulfamate, and mixtures thereof.

Disclosed are dye compositions of the formula ##STR1## wherein Cp and Cp' are each coupler compounds of the formula ##STR2## wherein the --COOH group and the --OH group can be in any position on either ring, provided that in the naphthalene ring system there is present least one hydrogen activated through resonance by the --OH group for an electrophilic aromatic substitution coupling reaction, n represents the number of substituents on the rings and is a number of from 0 to 8, and R represents the substituent groups on the ring, wherein each R is independently selected from the group consisting of hydroxyl groups, alkyl groups, substituted alkyl groups, aryl groups, substituted aryl groups, aryl-alkyl groups, substituted aryl-alkyl groups, halogen atoms, and nitro groups. Also disclosed are aqueous ink compositions containing the dyes, processes for making the dyes, processes for making the inks containing the dyes, and printing processes employing the inks.

Waterfast dye compositions

Disclosed is a printing process which comprises applying in imagewise fashion to a substrate an ink composition which comprises an aqueous liquid vehicle, a colorant, and an ionic compound at least partially ionizable in the liquid vehicle, said ink composition having a conductivity of at least about 10 milliSiemens per centimeter, and subsequently exposing the substrate to microwave radiation, thereby drying the images on the substrate. A specific embodiment of the invention is directed to a thermal ink jet printing process which comprises (1) incorporating into a thermal ink jet printing apparatus an ink composition which comprises an aqueous liquid vehicle, a colorant, and an ionic compound at least partially ionizable in the liquid vehicle, said ink composition having a conductivity of at least about 10 milliSiemens per centimeter; (2) heating the ink in an imagewise pattern to cause bubbles to form therein, thereby causing droplets of the ink to be ejected in an imagewise pattern onto a substrate, thereby generating images on the substrate; and (3) exposing the substrate to microwave radiation, thereby drying the images on the substrate.

Printing processes with microwave drying

A toner composition comprised of resin particles, pigment particles, and a polysalt charge enhancing additive of the following formula ##STR1## wherein X is an aromatic substituent.

Toner and developer compositions with charge enhancing additives

A positively charged liquid developer composition comprised of polymer particles, a hydrocarbon liquid component, a charge director comprised of lecithin, and as pigment particles the beta crystalline form of copper phthalocyanine.

Growing community of inventors

Hamlin, NY, United States of America

Edward J Radigan