Levelling auxiliaries for acid dyes
AssigneeBASF SE
InventorsNorbert Greif, Michele Vescia, Manfred Daeuble, Hans Heinrich
Life of this patent
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Abstract
A levelling auxiliary for dyeing fibrous material of polyamide fibers with acid dyes in the acid pH range in the presence of a mixture which contains (based on the solids in each case) from 30 to 90% by weight of a surfactant having sulfonic acid groups and from 10 to 70% by weight of an oxyethylated polyamide which has been prepared by the reaction of 1 part by weight of polyamide with from 2.5 to 3.5 parts by weight of ethylene oxide. Level dyeings devoid of streaks are obtained.
Claims6
In a process for dyeing a fibrous material consisting essentially of polyamide fibers with an acid dye in an acid pH range, the inprovement which comprises:
- carrying out the dyeing in the presence of a levelling auxiliary mixture which, based on the solids in each case, contains:
- a. from 30 to 90% by weight of a surfactant containing one or more sulfonic acid groups in salt form;
- and
- b. from 10 to 70% by weight of an oxyethylated synthetic linear polyamide which has been prepared by the reaction of 1 part by weight of polyamide with from 2.5 to 3.5 parts by weight of ethylene oxide.
A levelling auxiliary for use in dyeing a fibrous material consisting essentially of polyamide fibers with an acid dye in an acid pH range which comprises a mixture, based on the solids contained in the levelling agent, of:
- a. from 30 to 90% by weight of a surfactant containing one or more sulfonic acid groups;
- and
- b. from 10 to 70% by weight of an oxyethylated synthetic linear polyamide which has been obtained by the reaction of 1 part by weight of polyamide with from 2.5 to 3.5 parts by weight of ethylene oxide.
Dependencies are inferred from the claim text.