Lexmark International, Inc.

Crompton & Knowles Corporation

The United States of America As Represented by the United States

The United States of America As Represented by the Department of Energy

The United States of America

James F Feeman

Bradley Leonard Beach

Jing X Sun

Ann P Holloway

Peter R Hammond

Terence E Franey

Agnes Kam Zimmer

Ann M Piekunka

Jay E Rowe

Allen C Sanders

James M Mrvos

Donald Leo Elbert

Kelly Ann Killeen

Anna Marie Pearson

George F Field

John Melvin Olson

Robert L Vollmer

Rodney O Aulick

Kathryn E Burns

Robert L Wineholt

A light-resistant, metal complex dye for inkjet printing comprising a substituted 8-heterocyclic azo-5-aminoquinoline of the following structural formula: 

Metal complex dyes for inkjet inks

Provided are novel yellow azo dyes which are useful in ink compositions, especially ink jet compositions. The dyes and ink compositions of the present invention exhibit a good balance of optical density, print reliability, water fastness and light fashion and exhibit improved water solubility, thus rendering the ink compositions to be especially suitable for printheads having small nozzle openings.

Yellow dyes and ink compositions

Provided are novel black azo dyes which are useful in ink compositions, especially ink jet ink compositions. The dyes and ink compositions of the present invention exhibit a good balance of optical density, print reliability, water fastness and light fastness.

Black azo dyes

Ink compositions containing ultraviolet absorbing compounds of formula I

Ink compositions containing ultraviolet absorbers

A flocculating dye reduces bleed between two inks when they are applied side by side. A first ink comprises the flocculating dye which flocculates the dispersant-pigment of the second ink.

Methods of making cationic azo dye compounds having flocculating

Magenta dyes having flocculating properties

Yellow cationic dyes having flocculating properties

Novel water soluble dyes of the formula I are provided ##STR1## wherein R.sup.1 and R.sup.4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R.sup.1 -R.sup.2 or R.sup.2 -R.sup.4 form part of aliphatic heterocyclic rings; R.sup.2 is hydrogen or joined with R.sup.1 or R.sup.4 as described above; R.sup.3 is --(CH.sub.2).sub.m --SO.sub.3.sup.-, where m is 1 to 6;

Water soluble laser dyes

An ink system comprising a first ink containing a flocculating dye in an aqueous solution and a second ink containing a dispersant-pigment complex in an aqueous solution reduces bleed between the two inks when they are applied side by side. The flocculating dye flocculates the dispersant-pigment complex

Ink system with reduced bleed

The invention relates to an aqueous ink composition for use in ink jet printers comprising an aqueous carrier, a pigment, and, preferably, a graft polymer having a polyacrylic acid backbone and hydrophobic side chains.

Ink composition

A dye having a representative formula as follows and an ink providing waterfast printing having the dye, in which a surfactant is not essential: ##STR1##

Dye having hydrophobic substituent and aqueous ink

A water-soluble dye for a color subtractive, lightfast, wide spectrum ink as follows: ##STR1## wherein: X is ##STR2## R.sub.1 is: an aliphatic radical having from 1 to 18 carbon atoms; the radical ##STR3## in which R.sub.2 is --H, -lower alkyl of 1 to 4 C atoms, -lower alkoxy, -halogen, --NO.sub.2 --CN, --CO.sub.2 H;

Magenta dye, jet ink, and color set

A alkali-soluble dye for a waterfast ink having structural formula as follows: ##STR1## and an ink containing the dye dissolved in water. Printing from the ink is insoluble below pH 6.0; is an intense black at low concentration; and remains black on acid papers. The aqueous inks are stable and exhibit good printhead nozzle maintenance.

Waterfast dye and aqueous ink

A novel class of dye is disclosed which is particularly efficient and stable for dye laser applications, lasing between 540 and 570 nm.

Growing community of inventors

Wyomissing, PA, United States of America

James F Feeman