Polymeric additives to improve print quality and permanence attributes in ink-jet inks

Inactive Publication Date: 2002-10-24
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0011] Enhancement of waterfastness, smearfastness, smudgefastness, and lightfastness, as well as print quality

Problems solved by technology

However, for dye-based inks, the underprinting techniques known in art only marginally increase, or, most often, decrease chroma.
Similarly, in

Method used

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  • Polymeric additives to improve print quality and permanence attributes in ink-jet inks
  • Polymeric additives to improve print quality and permanence attributes in ink-jet inks
  • Polymeric additives to improve print quality and permanence attributes in ink-jet inks

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Embodiment Construction

[0012] Reference is now made in detail to a specific embodiment of the present invention, which illustrates the best mode presently contemplated by the inventors for practicing the invention. Alternative embodiments are also briefly described as applicable.

[0013] Color inks in ink-jet typically have cyan, magenta and yellow colors. Accordingly, the primary colors are cyan, magenta and yellow (C, M, Y). Binary colors are their binary combinations, that is, blue B=C+M, red R=M+Y, and green G=Y+C. Composite black (Comp-K=C+M+Y) is the black color formed by printing cyan, yellow and magenta inks together. It differs from the true black ink (true K), which is often supplied by ink-jet printers as a separate ink cartridge. Thus, in conventional color ink-jet printing, there are four pen cartridges-cyan (C), yellow (Y), magenta (M), and black (K).

[0014] The inks comprise a vehicle and at least one colorant, as is well-known.

[0015] The vehicle comprises one or more co-solvents and water. Th...

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Abstract

One-part and two-part fixatives are provided in conjunction with underprinting or overcoating at least one ink printed on a print medium. The one-part fixative of the present invention comprises a polymer in a vehicle. The polymer is selected from the group consisting of vinyl-based polymers, condensation polymers, and copolymers thereof and the polymer has a glass transition temperature within a range of -50° C. to +100° C., a melting temperature within a range of 30° C. to 150° C., and a molecular weight (weight average basis) within a range of 3,000 to 100,000. The fixative is contained in a separate cartridge from the ink-jet ink print cartridge(s). The two-part fixative of the present invention comprises (1) a reactive monomer or oligomer in a vehicle, the reactive monomer or oligomer selected from the group consisting of iso-cyanates and epoxy-terminated oligomers, and (2) at least one second component selected from the group consisting of polyols, polyvinyl alcohols, and base catalysts. The reactive monomer or oligomer is contained in a separate cartridge from the ink-jet ink print cartridge(s), while the second component(s) is contained in at least one ink-jet ink print cartridge. The reactive monomer or oligomer reacts with the second component(s) on the print medium to form a polymer, which has a glass transition temperature within a range of -20° C. to +50° C. and a melting temperature within a range of 30° C. to 100° C. Enhancement of waterfastness, smearfastness, smudgefastness, and lightfastness is provided by use of the fixative solution of the present invention.

Description

[0001] The present invention is directed to ink-jet inks, and, more particularly, to fixer compositions used in ink-jet printing to enhance printing performance, such as smearfastness, smudge resistance, waterfastness, and lightfastness.[0002] There is a considerable demand in a better image quality of ink-jet. The low smearfastness, waterfastness, and lightfastness and the tendency to smudge seem to be the main drawbacks of ink-jet, and this invention addresses these issues.[0003] Several techniques has been used in the prior art to address these issues. One such technique is underprinting, which helps to stratify the colorant to the surface of the paper, reduce wicking, and improve color performance. Underprinting is defined as applying a transparent fluid on substrate prior the ink deposition. There are several patents addressing the technique of underprinting for better waterfastness and bleed control; see, e.g., U.S. Pat. No. 5,624,484, "Liquid Composition and Ink Set, and Imag...

Claims

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Application Information

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IPC IPC(8): B41J2/21B41J11/00B41J2/01B41M5/00C09D11/00
CPCB41J2/2114B41M7/0018B41M5/0017B41J11/0015B41M5/00
Inventor TSANG, JOSEPH W.MOFFATT, JOHN R.
Owner HEWLETT PACKARD DEV CO LP
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