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Dyes for Jet Printing Inks

IP.com Disclosure Number: IPCOM000052264D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Sachdev, HS: AUTHOR [+2]

Abstract

Jet printing inks are, in general, aqueous-based fluids whose pH is limited not only by ink considerations but also materials compatibility constraints. At pH 10, corrosion of silicon nozzle arrays is a serious problem. Thus, a pH 7-based ink with good print quality properties is very desirable.

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Dyes for Jet Printing Inks

Jet printing inks are, in general, aqueous-based fluids whose pH is limited not only by ink considerations but also materials compatibility constraints. At pH 10, corrosion of silicon nozzle arrays is a serious problem. Thus, a pH 7-based ink with good print quality properties is very desirable.

We have prepared a series of modifications of Direct Black 19 which achieves this goal. Direct Black 19, when reacted with various diazonium salts, undergoes further coupling to yield a series of hexakisazo dyes. Depending upon the solubilizing group attached to the reactive diazonium salt, the formed dyes have improved solubility and waterfastness properties. The spectral properties are similar to Direct Black 19 starting material. Extinction coefficients tend to be slightly lower although the spectral absorption range is broader, resulting in a flat black instead of blue black as in Direct Black 19. Ames test data show the modifications to have a consistently lower level of mutagenic activity as compared with the starting material. Furthermore, we have aged samples of the inks at 60 degrees C, and they appear stable in terms of optical density and gross particulate information. Overall, the phosphonate solubilized modification is the most efficacious in terms of waterfastness and ease of synthesis.

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