Hewlett-packard Development Company, L.P.

Marlene Ann McGorrin

Zia Ur Rehman

Mary E Austin

Linda C Uhlir-Tsang

Paul Tyrell

Alexey S Kabalnov

John R Moffatt

Larrie A Deardurff

Patricia A Wang

Tye J Dodge

Murray Macleod

The present invention is directed to magenta inks and ink sets for ink-jet printing. The inks and ink sets provide exceptional ozone fastness, particularly when printed on porous media or plain paper. The inks of the ink sets are formulated to be compatible with each other and are capable of producing high quality printed images.

Magenta inks and ink sets for ink-jet imaging

A pretreatment fluid includes an effective amount of a fluorinated surfactant and a vehicle. The fluorinated surfactant is selected from at least one non-ionic fluorinated surfactant, at least one ionic fluorinated surfactant, and combinations thereof. The effective amount is selected based upon: a system in which the pretreatment fluid is used, an ink composition used in the system, system pretreatment time, pretreatment vehicle components, or combinations thereof.

Pretreatment fluid and method of making and using the same

In accordance with embodiments of the present invention, an ink-jet ink can comprise a dye and a liquid vehicle carrying the dye. The liquid vehicle can include a sulfonated aromatic compound present in the ink-jet ink at an effective concentration to cause improvement of ozone fastness of said ink-jet ink.

Ink-jet inks containing sulfonated aromatic compounds for reducing ozone fade

Compositions, systems, and methods of printing an ink-jet image are provided. The composition can include a liquid vehicle including water, a liquid vehicle having from 5 wt % to 35 wt % of total organic solvent content; from 1 wt % to 6 wt % of acid-functionalized pigment solids; and from 0.001 wt % to 6 wt % of styrene-maleic anhydride copolymer, said styrene-maleic anhydride copolymer having a weight average molecular weight from about 400 Mw to 15,000 Mw.

Pigmented ink-jet inks with improved print quality and reliability

An ink for use in combination with an ink-jet printer comprises a mixture including a colorant, a liquid vehicle comprising 1,6-hexanediol and 1,5-pentanediol in a ratio in the range of 1:4 (wt/wt) to 4:1 (wt/wt), and/or an amount of imidazole in the range of 0.1 wt % to 6 wt %, and potentially provides at least one of the following enhancements to the ink improved print quality, increased decap time, pen reliability, environmental robustness of ink in pen, environmental robustness of printed ink on media, and aid in maintaining the pH of the ink in a desired range.

Ink-jet ink formulations containing imidazole

An ink-jet ink comprises an aqueous liquid vehicle, at least 1% by weight colorant; and a black-to-color bleed control enhancing amount of magnesium sulfate or hydrate thereof.

Ink-jet ink formulations containing magnesium sulfate

An ink includes a jettable vehicle, a plurality of pigment solids dispersed in the jettable vehicle, and a styrene-maleimide copolymer dispersed in the jettable vehicle. Additionally, a method of rapidly printing an ink-jet image including ink-jetting an ink-jet ink onto a media substrate at a firing frequency from 12 kHz to 25 kHz, wherein the ink-jet ink includes a jettable vehicle, a plurality of non-acid-functionalized pigment solids dispersed in the jettable vehicle, and a styerene-maleimide copolymer dispersed in the jettable vehicle.

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Corvallis, OR, United States of America

Marlene Ann McGorrin