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Dyes and Compositions for Ink Jet Printing

IP.com Disclosure Number: IPCOM000004672D
Publication Date: 2001-Mar-30
Document File: 3 page(s) / 32K

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The IP.com Prior Art Database

Related Documents

WO99/43754: PATAPP [+2]

Abstract

Compositions for use in ink jet printing which comprise Direct Black 195 and a yellow azopyridone dye.

This text was extracted from a WORD97 document.
This is the abbreviated version, containing approximately 67% of the total text.

DYES AND COMPOSITIONS FOR INK-JET PRINTING

Ink jet printing ("IJP") is a non-impact printing technique in which droplets of ink are ejected through a fine nozzle onto a substrate without bringing the nozzle into contact with the substrate.

There are many demanding performance requirements for dyes and inks used in IJP. For example they desirably provide sharp, non-feathered images having good water-fastness, light-fastness and optical density. The inks are often required to dry quickly when applied to a substrate to prevent smudging, but they should not form a crust over the tip of an ink jet nozzle because this will stop the printer from working. The inks should also be stable to storage over time without decomposing or forming a precipitate which could block the fine nozzle.

Ink-jet inks may be prepared from compositions which comprise one or more yellow dyes and one or more black dyes. Examples of suitable yellow dyes include are water-soluble azo and bis azo dyes such as C.I. Direct Yellow 86, C.I. Direct Yellow 132, C.I. Direct Yellow 142, C.I. Direct Yellow 173 and C.I. Acid Yellow 23. Examples of suitable black dyes include water-soluble azo, bis azo and tris azo dyes such as C.I. Direct Black 19, C.I. Direct Black 168, C.I. Direct Black 195, C.I. Direct Black 286 and C.I. Direct Black 287. The compositions may also comprise one or more water-soluble cyan dyes such as C.I. Direct Blue 199 or C.I. Acid Blue 9.

The preparation and compositions of inks along with typical solvents, additives, etc which are used in ink-jet printing is disclosed in PCT patent publication no WO 99/43754.

Particular compositions of yellow and black dyes are summarised in Table 1. The yellow dye may be represented by the following formula (1):

Formula (1)

or as its tautomer 3-carboxy-1-{5-[(E)-(2-carboxy-4-sulphophenyl)diazenyl]-2,6-dihydroxy-4-methylpyridin-3-yl}pyridinium. The black dye is CI Direct Black 195. Salts of both dyes may be used in the compositions.

Inks made from these compositions satisfy the above performance requirements and give ink-jet prints which show improvements in shade, fastness properties and reduction of bronzing.

TABLE 1 Compositions Comprising Direct Black 195 and Yellow Dye of Formula (1)

1

2

3

4

5

6

7

8

Yellow Dye

0.25

0.5

0.75

1

1.5

0.5

0.75

0.75

Direct Black 195

4.75

4.5

4.25

4

3.5

4.5

4.25

4.25

glycerol

8

10

5

3

0

8

5

0

urea

5

2

3

5

7

9

5

2

2-pyrrolidone

5

5

3

3

0

0

5

9

Thiodiglycol

0

5

0

0

0

6

5

9

diethylene glycol

0

0

7

5

8

0

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