Concentrated leucoindigo solutions
AssigneeDyStar Textilfarben GmbH & Co. Deutschland KG
InventorsManfred Gäng, Rudolf Krüger, Peter Miederer
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Abstract
Concentrated leuco indigo solutions useful for dyeing cellulosic textile material consist essentially of from 25 to 55% by weight of leuco indigo in the form of the leuco indigo salt, an amount which is essentially stoichiometrically sufficient to convert the leuco indigo into the neutral leuco indigo salt of a mixture of at least two alkali metal hydroxides wherein none of the alkali metal hydroxides accounts for more than 70 mol %, and water.
Claims8
A concentrated leuco indigo solution consisting essentially of from 25 to 55% by weight of leuco indigo, an amount which is essentially stoichiometrically sufficient to convert the leuco indigo into the neutral leuco indigo salt of a mixture of at least two alkali metal hydroxides wherein none of the alkali metal hydroxides accounts for more than 70 mol %, and water wherein the leuco indigo is in the form of its salt in said solution.
Dependencies are inferred from the claim text.