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US 5,391,207 AGranted
Liquid dyestuff preparations
AssigneeBayer Aktiengesellschaft
InventorsRainer Gerlach, Winfried Mennicke, Wolfgang Mullers
Life of this patent
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Abstract
Improved dyestuff solutions for the dyeing of leather contain 5 to 30 parts by weight of a dyestuff, 20 to 80 parts by weight of an alkoxy alcohol of the formula (I) R--O--(--A--O--).sub.n --H (I), 10 to 40 parts by weight of a lactone, lactam or cyclic urea and 5 to 50 parts by weight of water.
Claims16
A process for the dyeing of leather which comprises applying to the leather a liquid dyestuff preparation containing
- 5 to 30 parts by weight of at least one ionic metal-free azo dyestuff or metal-containing azo or azomethine dyestuff,
- 15to 80 parts by weight of at least one alkoxy alcohol of the formula
- R--O--(--A--O--).sub.n --H (I),
- in which
- R denotes straight-chain or branched C.sub.1 -C.sub.4 -alkyl,
- A denotes straight-chain or branched C.sub.2 -C.sub.3 -alkylene and
- n denotes 1, 2 or 3,
- 6 to 40 parts by weight of at least one of a lactone, lactam or cyclic urea, and
- 5 to 50 parts by weight of water.
6 more elements
Dependencies are inferred from the claim text.