EP0356080A2
Expired / Lapsed
EP
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Anionic dye
Assignee: Avecia Ltd
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Filing: 1989-08-10
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Granted: —
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Expires: 2009-08-10
Abstract
Abstract A dye which, in the free acid form, has the formula wherein W is COOH X is selected from H, COOH, SO₃H, halo, hydroxy, nitro, cyano, C₁₋₆-alkyl, C₁₋₆-alkoxy and C₁₋₆-acylamino; Y is H, COOH or SO₃H; Z is H, COOH or SO₃H; R & R¹ are each independently H or C₁₋₆-alkyl substituted by 0, 1 or 2 -COOR² groups; and R² is H or C₁₋₆-alkyl; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO₃H groups. The dye is adapted for the preparation of inks for use in ink jet printing in which it displays high water-fastness on paper.
Inventors
- 👤 David Greenwood
- 👤 Nigel Hughes
- 👤 Suraj Lakshman Hindagolla
- 👤 Ronald Wynford Kenyon
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 19:32
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/30; C09D11/32; C09D11/328; C09B; C09B31/00; C09B31/02; C09B31/08; C09B67/00; C09B67/0001; C09B67/002; C09B67/0033; C09B67/0046; C09B67/0055; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A dye which, in the free acid form, has the formula wherein W is COOH X is selected from H, COOH, SO₃H, halo, hydroxy, nitro, cyano, C₁₋₆-alkyl, C₁₋₆-alkoxy and C₁₋₆-acylamino; Y is H, COOH or SO₃H; Z is H, COOH or SO₃H; R & R¹ are each independently H or C₁₋₆-alkyl substituted by 0, 1 or 2 -COOR² groups; and R² is H or C₁₋₆-alkyl; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO₃H groups.
Claim 2
Dependent Claim
92 words
A dye which, in the free acid form, has the formula wherein W is COOH X is selected from H, COOH, SO₃H, halo, hydroxy, nitro, cyano, C₁₋₆-alkyl, C₁₋₆-alkoxy and C₁₋₆-acylamino; Y is H, COOH or SO₃H; Z is H, COOH or SO₃H; R & R¹ are each independently H or C₁₋₆-alkyl substituted by 0, 1 or 2 -COOR² groups; and R² is H or C₁₋₆-alkyl; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO₃H groups.
Claim 3
Dependent Claim
13 words
A dye according to claim 1 in which X is H or COOH.
Claim 4
Dependent Claim
20 words
A dye according to claim 1 or 2 in which R¹ is H and R is H, CH₂COOH or C₂H₄COOH.
Claim 5
Dependent Claim
25 words
A dye according to any one of Claims 1 to 3 containing 2, 3 or 4 CO₂H groups attached directly to an aromatic carbon atom.
Claim 6
Dependent Claim
23 words
A dye which, in its free acid form, has the formula wherein Y is H or SO₃H Z is H, COOH or SO₃H.
Claim 7
Dependent Claim
23 words
A dye which, in its free acid form, has the formula wherein Y is H or SO₃H Z is H, COOH or SO₃H.
Claim 8
Dependent Claim
36 words
A composition of dyes comprising the dye according to Claim 5 in which Y is SO₃H and Z is H and the dye according to Claim 5 in which Y is H and Z is SO₃H.
Claim 9
Dependent Claim
36 words
A composition of dyes comprising the dye according to Claim 5 in which Y is H and Z is COOH and the dye according to Claim 5 in which Y is COOH and Z is H.
Claim 10
Dependent Claim
48 words
A dye according to any of claims 1 to 7 in the form of its salt with at least one of the basic compounds selected from the alkali earth metals, ammonia, methylamine, dimethylamine, trimethylamine, ethylamine, n-propylamine, iso-propylamine, n-butylamine, iso-butylamine, sec-butylamine, tert-butylamine, piperidine, pyridine, morpholine, alkylamine, diethylamine and triethylamine.
Claim 11
Dependent Claim
17 words
A dye according to claim 8 in the form of its sodium, ammonium, or mixed sodium/ammonium salt.
Claim 12
Dependent Claim
41 words
A process for the manufacture of dyes as claimed in any one of Claims 1 to 7 which comprises diazotising a compound which in the free acid form is of the formula: and coupling with a substituted naphthalene of the formula:
Claim 13
Dependent Claim
67 words
A process for the preparation of a dye according to any one of Claims 1 to 9 in the form of its salt with ammonia or an amine which comprises dissolving the dye in the form or a salt with an alkali metal, acidifying with a mineral acid, adjusting the solution to pH 9-9.5 with ammonia or the amine and removing alkali metal chloride ions by dialysis.
References Cited (Backward Citations)
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