Vat dye based on flouranthene
AssigneeBASF SE
InventorsManfred Patsch, Gerhard Epple, Helmut Flohr, Helmut Degen, Uwe Nahr
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Abstract
A vat dye based on monobromofluoranthene is prepared by a process in which monobromofluoranthene which contains no more than 7% of dibromofluoranthene is reacted with 1-amino-4-benzoylaminoanthraquinone, the reaction product is condensed at from 50.degree. to 70.degree. C. in 83-88% strength sulfuric acid to give the carbazole compound, and the latter is then further brominated to a bromine content of from 20 to 23% by weight. The dyes obtained by the novel process are very useful for dyeing cotton.
Claims2
A vat dye based on a condensate of monobromofluoranthene which contains not more than 7% dibromofluoranthene which is prepared by the process comprising:
- reacting monobromofluoranthene containing no more than 7% by weight dibromofluoranthene with 1-amino-4-benzoylaminoanthraquinone in a 1:1 molar ratio;
- condensing the reaction product of the first step at from 50.degree.-70.degree. C. in 83-88% strength by weight sulfuric acid to yield the carbazole compound;
- and
- brominating the carbazole compound obtained to a bromine content of 20-23% by weight.
Dependencies are inferred from the claim text.