Pad-dyeing of cellulose fibers with sulfur black dyes: mixture of dithionite and glucose reducing sugar as reducing agent in aqueous alkaline dye bath
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United States of America Patent
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Aug 10, 1993
Grant Date -
N/A
app pub date -
Jan 29, 1992
filing date -
Jan 31, 1991
priority date (Note) -
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Abstract
Cellulose fibers are dyed ecologically soundly with sulfur black dyes by the pad-dyeing process by avoiding sulfides as reducing agent by replacing them by a dithionite-based mixture with at least one reducing sugar. A high color yield, a deep black shade and good reproducibility are ensured. The preferred reducing sugar is glucose.
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