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US 4,234,480 AGranted
Water-soluble azo dyestuffs
AssigneeBayer Aktiengesellschaft
InventorErich Kramer
Life of this patent
Estimating the term…
Abstract
The application relates to new azo dyestuffs which, in the form of the free acid, correspond to the general formula ##STR1## in which D, R, m and X have the meaning indicated in the description, their preparation and their use for dyeing and printing cellulose-containing materials, in particular paper and cotton.
Claims4
Azo dyestuffs which, in the form of the free acid, correspond to the general formula ##STR45## in which X denotes a radical of the formula ##STR46## D denotes a radical of the formulae ##STR47## R denotes hydrogen, methyl, ethyl, methoxy, ethoxy or chlorine, m, p, q and r denote 0 or 1 and
- n denotes 1 or 2,
- with the proviso that the dyestuffs contain at least 2 sulphonic acid groups.
Dependencies are inferred from the claim text.