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Dyes and Compositions for Ink Jet Printing

IP.com Disclosure Number: IPCOM000005022D
Publication Date: 2001-Jul-17
Document File: 3 page(s) / 119K

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US5684140: PATENT [+3]

Abstract

The preparation and compositions of inks are described which comprise one or more yellow dyes, and which show improvements in shade and environmental fastness properties such as lightfastness and ozonefastness.

This text was extracted from a WORD97 document.
This is the abbreviated version, containing approximately 20% 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 chroma. 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. 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.

The preparation and compositions of inks along with typical solvents, additives, etc which are used in ink-jet printing are disclosed in PCT patent publication no WO 99/43754, and US patents numbers US5684140 and US 5413630.

Particular compositions of yellow dyes are summarised in Tables 1-6. The yellow dye may be represented by either of the following formulae (1) and (2) and these may be used alone, as a mixture, or as a mixture with the dyes mentioned above:

Formula (1)

or as its tautomer 3-carboxy-1-{5-[(E)-(2-carboxy-4-sulphophenyl)diazenyl]-2,6-dihydroxy-4-methylpyridin-3-yl}pyridinium.

Formula (2)

Salts of the dye(s) 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 and environmental fastness properties, such as lightfastness and ozonefastness.

Table 1

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Yellow Dye

2.5

3

1.3

2.5

4.2

2.8

3.1

2.5

3

8

5

2.7

3.1

4.2

2.5

Glycerol

8

10

5

3

0

8

5

0

0

0

0

5

0

10

0

Urea

5

2

3

5

7

9

5

2

2

0

0

5

6

2

0

2-Pyrolidone

5

5

3

3

0

0

5

9

5

10

5

0

0

5

10

Thiodiglycol

0

5

0

0

0

6

5

9

5

7

5

0

6

5

0

Diethylene Glycol

0

0

7

5

8

0

0

0

7