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US 5,194,598 AGranted
Azo dyestuffs in which the coupling component contains an N,N-bis(alkoxy carbonylalkyl) substituent
AssigneeBayer Aktiengesellschaft
InventorRainer Hamprecht
Life of this patent
Estimating the term…
Abstract
Azo dyestuffs of the formula ##STR1## in which X denotes H, F, Cl, Br, I, R, CO.sub.2 R, CN, CF.sub.3 and the like, Y/Z denotes H, CH.sub.3, Cl or Br, R.sup.1, R.sup.2 and R denote C.sub.1 -C.sub.4 -alkyl and R.sup.3 and R.sup.4 denote H or CH.sub.3, are highly suitable for the dyeing of polyester fibres, where they are distinguished by a high thermomigration fastness. The preparation of the dyestuffs is preferably carried out by so-called "halogen/cyano exchange".
Claims2
An azo dyestuff of the formula ##STR19## wherein X denotes Cl, Br or CO.sub.2 R,
- R denotes C.sub.1-4 -alkyl or C.sub.5-6 cycloalkyl,
- Y denotes H,
- Z denotes H,
- R.sup.1 /R.sup.2 denotes CH.sub.3 or C.sub.2 H.sub.5 and
- R.sup.3 /R.sup.4 denotes H.
2 more elements
Dependencies are inferred from the claim text.