E.i. Dupont De Nemours and Company

Howard Matrick

Sheau-Hwa Ma

Harry J Spinelli

Arthur C Shor

Loren E Johnson

Dominic M Chan

Michele E Shepard

Glenn M Russo

Ronald Albert Askeland

Robert P Held

John L Stoffel, Jr

Mark L Choy

Eugene L Grubb

John R Moffatt

Mark S Hickman

Keshava A Prasad

Young S You

Jerome Hochberg

Leonard Slevin

Peter J McCartin

Bohdan Rakoczy

Catherine B Hunt

John T Rich

Josette C Seibles

John Lawrence Stoffel

A process for alleviating bleed and improving color in printed elements comprises applying an anionic printing liquid and a cationic printing liquid to a substrate adjacent to one another, wherein at least one of the printing liquids contains a polymer and reacting the anionic and cationic printing liquids with one another; wherein the color integrity of the anionic and cationic printing liquids is maintained.

Process for alleviating bleed and improving color in printed elements

Process for alleviating bleed in printed elements

Ink jet ink compositions consisting essentially of an aqueous carrier medium; an anionic dye; and an anionic polymer have excellent decap and puddling behavior and may be used with a variety of ink jet printers such as continuous, piezoelectric, drop-on-demand and thermal or bubble jet drop-on-demand, and are particularly adapted for use in thermal ink jet printers.

Aqueous anionic dye based ink jet inks

Aqueous ink compositions containing anti-curl agents substantially reduce or eliminate paper curl in plain-paper printed elements without adversely effecting storage stability, decap properties or print quality, and thus eliminate the need for expensive and bulky mechanical curl-arresting devices or special curl-resistant substrates. Printing the inks on plain-paper substrates is the sole step in a process for reducing paper curl in plain-paper printed elements.

Aqueous ink compositions containing anti-curl agents

An aqueous ink jet ink comprises an aqueous carrier medium, a colorant and at least one alkylpolyol ether cosolvent selected from the group of alkyl-bis-oxyalkyldiols, olefinic oxyalkyl diols, alkyl-tris-oxyalkyldiols and alkyl-tetrakis-oxyalkyldiols exhibit rapid drying, excellent image definition, are storage stable, have low odor and have excellent decap properties.

Alkylpolyol ethers as cosolvents for ink jet inks

Aqueous ink jet ink compositions comprising an aqueous carrier medium, a colorant, and cosolvents which are selected amide, sulfonamide, urea and thiourea derivatives of polyoxyalkyleneamines having a solubility in water of at least 4.5% at 25.degree. C., have high optical density, excellent print quality, excellent dispersion stability, and resist film formation on resistors without adversely affecting decap time or crusting.

Derivatives of polyoxyalkyleneamines as cosolvents for aqueous ink jet

Ink compositions for ink jet printers comprise an aqueous carrier medium, pigment dispersion or dye and a selected amide or lactam penetrant having a solubility in water of at least 4.5% at 25.degree. C. and 5-10 carbon atoms exhibit rapid drying, excellent storage stability and have excellent crusting properties.

Penetrants for aqueous ink jet inks

A pigmented ink for ink jet printers which comprises an aqueous carrier medium, pigment particles dispersed in an AB or BAB block copolymer having a hydrophilic segment and a segment that links to the pigment, and an effective amount of a surfactant sufficient to decrease the drying time of the ink. The A block and the B block(s) have molecular weights of at least 300. These inks give images having good print quality, water and smear resistance, lightfastness, and storage stability.

Aqueous pigmented inks for ink jet printers

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a nitrogen heterocyclic diol cosolvent which retards or inhibits pluggage failure. The cosolvent has a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. The pigment dispersion consists of pigment particles and a polymeric dispersant, having a hydrophilic segment and a segment that links to the pigment. These inks exhibit excellent decap performance, are storage stable and give images having excellent print quality.

Aqueous ink jet inks containing alkylene oxide condensates of certain

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a polyol/alkylene oxide condensate cosolvent which eliminates film formation on thermal ink jet resistor surfaces thereby eliminating non-uniformity in optical density. The cosolvent present at least 5% has a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. and a general formula: ##STR1## wherein X=--H or --CH.sub.3 ;

Aqueous ink jet inks containing polyol/alkylene oxide condensates as

Aqueous ink jet ink compositions comprising an aqueous carrier medium, a colorant, such as a pigment dispersion or dye, and a nitrogen-containing organic cosolvent having a solubility in water of at least 4.5 % at 25.degree. C., exhibit freedom from plug formation and excellent storage stability.

Nitrogen-containing organic cosolvents for aqueous ink jet inks

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a cosolvent which retards or inhibits pluggage failure. The latter is an cycloaliphatic diol having a total of at least 6 carbon atoms and having a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. The pigment dispersion consists of pigment particles and a dispersant, preferably a polymeric dispersant, having a hydrophilic segment and a segment that links to the pigment. These inks exhibit long decap times, are storage stable, have reliable performance and give images having good print quality.

Aqueous ink jet inks containing cycloaliphatic diol pluggage inhibitors

Aqueous ink jet ink compositions comprising an aqueous carrier medium, a colorant and a sulfoxide or sulfone penetrant having a solubility in water of at least 4.5% at 25.degree. C. and represented by the formula:

Sulfur-containing penetrants for ink jet inks

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and an amide diol or ester diol cosolvent penetrant such as hydroxypivalyl hydroxypivalate. The cosolvent penetrant has a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. The pigment dispersion consists of pigment particles and a dispersant, preferably a polymeric dispersant, having a hydrophilic segment and a segment that links to the pigment. These inks exhibit rapid drying, have excellent decap performance, are storage stable and give images having good print quality.

Aqueous ink jet inks containing ester diol and amide diol cosolvents

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a diol penetrant. The latter is an aliphatic diol having at least 6 carbon atoms, a solubility in water of at least 4.5 parts in 100 parts of water at 25.degree. C. and is selected from the group consisting essentially of:

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Highlands, NJ, United States of America

Howard Matrick