Hewlett-packard Company

E.i. Dupont De Nemours and Company

Young S You

John D Meyer

An-Chung Robert Lin

Robert J Miller

Howard S Tom

Howard Matrick

Michele E Shepard

Miller Robert J

Disclosed herein are substantially homogeneous solid ink-jet ink compositions. The use of such compositions with colored transparencies substantially reduces the level of light scattering as compared to the level of light scattering arising from the use of non-homogeneous ink-jet ink compositions. It is also disclosed that further improvements in the ink-jet ink composition can be achieved by employing a cosolvent in the composition.

Solid ink compositions suitable for use in color transparencies

A single-pulse driver for a bubble driven ink jet ink having good staying power at operating temperature, the driver being a solvent for the ink carrier, having a molecular weight less than 150, a boiling point less than 140 centigrade degrees higher than its melting point and a boiling temperature not lower than 120.degree. centigrade.

Solid driver for the solid ink jet ink

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

Disclosed herein are aqueous ink compositions containing a specific humectant or a mixture of such humectants. The use of such humectants in aqueous ink compositions greatly mitigates the problems arising with the crusting and clogging of orifice plates in thermal ink jet printers associated with aqueous ink compositions not employing a humectant. Additionally, the use of such humectants in aqueous ink compositions greatly mitigates the kogation problems arising in thermal ink-jet printers from humectants heretofore employed in aqueous ink compositions.

Water based ink compositions exhibiting reduced crusting, clogging and

Disclosed is an ink-jet composition including an organic carrier that is solid at 25.degree. C. and liquid at the operating temperature of an ink-jet nozzle and a driver having a critical pressure greater than 10 atmospheres, the carrier and driver being miscible in liquid phase. The ink-jet composition is characterized by a viscosity of less than 15 centipoise at 90.degree. C. and a surface tension of between about 20 to about 25 dynes per centimeter at 90.degree. C. The ink-jet compositions disclosed herein are particularly useful in thermal ink-jet printing using thermally induced vapor bubbles to eject ink droplets from the printer and onto a substrate.

Solid ink compositions for thermal ink-jet printing having improved

An ink jet ink including a waxy carrier that is solid at 25.degree. C. and liquid at the operating temperature of an ink jet nozzle and a driver having a critical pressure greater than 10 atmospheres, the carrier and driver being miscible in liquid phase.

Vaporizable solid ink composition for thermal ink-jet printing

An ink jet ink in the form of a microemulsion of an organic vehicle phase having a colorant dispersed therein and an aqueous phase containing a surfactant, the vehicle phase preferably being liquid at 70.degree. C. and solid at 20.degree. C.

Microemulsion ink jet ink composition

A novel ionic surface preparation for nozzles used in spraying fluid droplets such as used in ink jet printers is disclosed. In conjunction with an oppositely charged ionic anti-wetting agent dissolved in the sprayed fluid, the new surface preparation reliably reduces the wetting of the nozzle surfaces, thereby facilitating the production of more uniform and predictable droplets.

Growing community of inventors

Los Altos, CA, United States of America

Young S You