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| Inks |
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| Amine-containing block polymers for pigmented ink jet inks |
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| Use of solids as antiblocking additives for marker liquids |
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| Radiation-sensitive mixture and use thereof |
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| Hot melt inks for continuous jet printing |
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Nitrogen-containing organic cosolvents for aqueous ink jet inks
| Details |
Inventors: Matrick, Howard; Chan, Dominic M.; Russo, Glenn M.;
Assignee: E. I. du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Beck; Shrive
Assistant Examiner: Klemanski; Helene
Attorney, Agent or Firm:
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. |
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DETAILED DESCRIPTION OF THE INVENTION The ink jet ink compositions of this invention are particularly suited for use in ink jet printers in general, and thermal ink jet printers in particular.
The ink jet ink compositions encompasses both pigment and dye colorant inks.
The inks may be adapted to the requirements of a particular ink jet printer to provide a balance of light stability, smear resistance, viscosity, surface tension, optical density, low toxicity, high material compatibility and drying rate.
The organic cosolvents of this invention are stable to oxygen and are especially resistant to hydrolysis in aqueous inks when formulated near a neutral pH.
AQUEOUS CARRIER MEDIUM The aqueous carrier medium comprises water (preferably deionized water) or a mixture of water and at least one water soluble organic solvent other than the selected nitrogen-containing solvent.
Representative examples of water-soluble organic solvents are disclosed in U.
S.
Pat.
No.
5,085,698, the disclosure of which is incorporated herein by reference.
Selection of a suitable mixture of water and water soluble organic solvent depends upon the requirements of the specific application, such as desired surface tension and viscosity, the selected colorant, drying time of the ink, and the type of substrate onto which the ink will be printed.
A mixture of a water soluble organic solvent having at least 1 hydroxyl group (diethylene glycol, triethylene glycol, butyl carbitol, etc.
) and deionized water is preferred as the aqueous carrier medium.
The aqueous carrier medium usually contains from about 5% to about 95% water, with the remainder (i.
e.
, 95% to about 5%) being the water soluble organic solvent.
The preferred ratios are approximately 60% to about 95% water, based on the total weight of the aqueous carrier medium.
Most preferably, the aqueous vehicle comprises about 90% water and the balance a glycol ether such as butyl carbitol.
Higher concentrations of glycols may result in poor print quality.
Lower concentrations will lead to drying out of the printhead or "crusting" of the ink
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