Concentrated leucoindigo solutions
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United States of America Patent
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Aug 6, 2002
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app pub date -
Jan 12, 2001
filing date -
Jul 13, 1998
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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.
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