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US 5,872,228 AGranted
Process for the preparation of reactive azo dyes
AssigneeBayer Aktiengesellschaft
InventorKlaus Kunde
Life of this patent
Estimating the term…
Abstract
Reactive dyestuffs of the formula (I) ##STR1## wherein A denotes the radical of a diazo component and X is a fibre-reactive heterocyclic radical are obtained by hydrolysis of maleylated azo dyestuffs of the formula (IV) ##STR2## and subsequent reaction with reactive components of the formula X-Hal without intermediate isolation, the other substituents having the meaning given in the description.
Claims15
Process for the preparation of compounds which, in the form of their free acid, correspond to the formula (I) ##STR55## wherein m denotes 0 or 1,
- A denotes the radical of a diazo component and
- X denotes a fibre-reactive heterocyclic radical,
- characterized in that maleylated aminoazo dyestuffs of the formula (IV) ##STR56## wherein A and m have the abovementioned meaning,
- are hydrolysed and the compound obtained by this reaction is reacted, without intermediate isolation, with a reactive component of the formula (VI)
- X-Hal (VI)
- wherein
- X has the abovementioned meaning and
- Hal represents halogen.
5 more elements
Dependencies are inferred from the claim text.