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Inkjet ink

a technology of inkjet and ink, applied in the field of inkjet ink, can solve the problems of soluble unstructured (random) polymer addition that is detrimental to jetting performance, and achieve the effect of improving the fastness of printed images

Inactive Publication Date: 2005-01-27
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It has now been found that the addition of a soluble structured polymer binder to an aqueous ink comprising SDP colorant allows improved fastness of the printed image without compromising jetting performance. In contrast, addition of soluble unstructured (random) polymer is detrimental to jetting performance.
Further, it has been found that the jetting performance of an ink comprising a SDP and a dispersed polymer binder can be improved by addition of a soluble structured polymer.

Problems solved by technology

In contrast, addition of soluble unstructured (random) polymer is detrimental to jetting performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

Dispersion 1

Carbon black (S-160 from Degussa, surface area 150 m2 / g) was oxidized with ozone according to the process described in WO01 / 94476 and neutralized with LiOH. After recovery, a 16.6 weight percent dispersion of self-dispersing carbon black pigment in water was obtained with a viscosity of 3.5 cps (25° C.). The median particle size was 110 nm and the acid number (degree of functionalization) was 3.3 μmol / m2. The degree of functionalization, as measured, was slightly above the target level of <3.0 μmol / m2.

The degree of functionalization (acid value) of this SDP (and others in these examples made by the process according to WO01 / 94476) was determined by the equivalent moles of base required to neutralize the treated pigment to a pH of 7. As the surface hydrophilic groups are substantially all acidic, the acid value also equals the degree of functionalization.

Equivalent moles of base can be determined by titration or, in the case of inorganic bases such as alkali m...

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Abstract

This invention pertains to an ink for inkjet printing, in particular to an aqueous ink comprising a self-dispersing pigment colorant and certain soluble polymers which enhance print quality without compromising jetting performance.

Description

BACKGROUND OF THE INVENTION This invention pertains to an inkjet ink, in particular to an aqueous inkjet ink comprising self-dispersible pigment and certain soluble polymers to improve print quality. Inkjet printing is a non-impact printing process in which droplets of ink are deposited on print media, such as paper, to form the desired image. The droplets are ejected from a printhead in response to electrical signals generated by a microprocessor. Both dyes and pigments have been used as colorants for inkjet inks. While dyes are typically easier to formulate compared to pigments, they tend to fade quickly and are more prone to rub off. Inks comprising pigments dispersed in aqueous media are advantageously superior to inks using water-soluble dyes in water-fastness and light-fastness of printed images. Pigments suitable for aqueous inkjet inks are in general well-known in the art. Traditionally, pigments were stabilized by dispersing agents, such as polymeric dispersants or surf...

Claims

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Application Information

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CPCC09D11/40C09D11/324
Inventor VALENTINI, JOSE E.FAKE, DEAN M.
Owner EI DU PONT DE NEMOURS & CO
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