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US 4,091,021 AGranted
Azo dyestuffs
AssigneeImperial Chemical Industries PLC
InventorsHerbert Francis Andrew, David William Crichton Ramsay, Cecil Vivian Stead
Life of this patent
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Abstract
Azo dyestuffs, which in the acid form, are represented by the formula: A -- N .dbd. N -- M -- N .dbd. N -- E (1) wherein A is an aromatic radical, M is a 1,4-benzene radical which may be substituted, E is the residue of a coupling component which is free from azo groups, At least one of A and M containing a phosphonic acid group, and the metal complexes of those having a metallisable group are reactive dyes suitable for use in the process of German OLS No. 2324809.
Claims6
An azo dyestuff having the formula
- A--N.dbd.N--M--N.dbd.N--E
- wherein
- A is a benzene radical having a phosphonic acid group and optionally containing a further substituent selected from the group consisting of methyl, chlorine, methoxy and nitro,
- M is a 1,4 phenylene radical optionally containing up to 2 substituents selected from the group consisting of methyl, methoxy, phosphonomethyl, acetylamino and carboxylic acid, and
- E is the residue of a coupling component selected from the group consisting of naphthol sulphonic acid, aminonaphthol sulphonic acid and lower alkanoylaminonaphthol sulphonic acid.
2 more elements
Dependencies are inferred from the claim text.