Vat dyes
AssigneeBASF SE
InventorsMatthias Niedenbrueck, Manfred Patsch, Michael Schmitt
Life of this patent
Estimating the term…
Abstract
Vat dyes obtainable by a) halogenation of dibenzanthrone with bromine in the presence of chlorosulfonic acid and of a halogenation catalyst to a bromine content from 26 to 32% by weight and a chlorine content from 1 to 5% by weight, and b) condensation of the isolated halogenation product with 1-aminoanthraquinone in a molar ratio from 1:2 to 1:2.5 in the presence of an inert solvent, the concentration of halogenated dibenzanthrone and 1-aminoanthraquinone together being at least 200 g/l of solvent are useful for dyeing or printing cellulose-containing textile material.
Claims7
A vat dye prepared by a process comprising:
- (a) halogenating dibenzanthrone with bromine in the presence of chlorosulfonic acid and a halogenation catalyst to a bromine content of from 26 to 32% by weight and a chlorine content of from 1 to 5% by weight and
- (b) condensing the isolated halogenation product with 1aminoanthraquinone in a molar ratio of from 1:2 to 1:2.5 in the presence of an inert solvent, the concentration of the halogenated dibenzanthrone and 1-aminoanthraquinone together being at least 200 g/l of solvent.
A method for dyeing or printing cellulose-containing textile material, which comprises:
- dyeing a cellulose-containing textile material with the vat dye of claim 6.
A process for preparing vat dyes, which comprises:
- (a) halogenating dibenzanthrone with bromine in the presence of chlorosulfonic acid and a halogenation catalyst to a bromine content of from 26 to 32% by weight and a chlorine content of from 1 to 5% by weight and
- (b) condensing the isolated halogenation product with 1aminoanthraquinone in a molar ratio of from 1:2 to 1:2.5 in the presence of an inert solvent, the concentration of the halogenated dibenzanthrone and 1-aminoanthraquinone together being at least 200 g/l of solvent.
Dependencies are inferred from the claim text.