Batchwise dyeing of cellulosic textile material with indigo by the exhaust method
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United States of America Patent
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Dec 21, 1999
Grant Date -
N/A
app pub date -
Jul 9, 1997
filing date -
Jul 16, 1996
priority date (Note) -
Expired
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Abstract
The disclosure is a process for batchwise dyeing of cellulosic textile material with indigo by the exhaust method, which comprises applying the reduced indigo to the textile material from an aqueous dyeing liquor which includes a reductant, an alkali and additionally a further dissolved alkali metal salt in a concentration of from 200 to 350 g/l as electrolyte and whose pH has been set to 10.2-11.3, oxidizing the reduced indigo on the fiber back to the pigment while maintaining the high electrolyte concentration, and finishing the dyeing in a conventional manner.
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