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US 9,023,118 B2Granted
Azo dyes
AssigneeKemira Oyj
InventorsHelmut-Martin Meier, Christof Heide, Klaus-Günter Strumpf, Thomas Hübbe
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Abstract
The present invention relates to new azo dyes, a process for their preparation, and their use for dyeing or printing fibrous materials, to produce materials with brownish shades.
Claims16
A compound of formula (1)
- wherein
- A represents
- and B represents
- or A and B, independently of each other, represent one of the following groups:
- wherein R1, R2, R3, and R4, independently of each other, represent hydrogen, substituted or unsubstituted C1-C4 alkyl, substituted or unsubstituted C1-C4 alkoxy, substituted or unsubstituted aryl, substituted or unsubstituted phenyl, amino, sulfonic, carboxyl, hydroxyl, nitro or halogen groups, wherein at least one of R2 and R3 is a sulfonic group.
2 more elements
Dependencies are inferred from the claim text.