Method of stripping dyes from high-boiling non-ionic media
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United States of America Patent
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Jun 28, 1988
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N/A
app pub date -
Apr 15, 1987
filing date -
Apr 15, 1987
priority date (Note) -
Expired
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Abstract
Dyes are removed from waterless dye compositions by mixing the dyeing composition, composed of one or more dyes in a high-boiling, nonionic liquid, with an extraction solvent that is immiscible with the high-boiling liquid, yet solubilizes the dye. The dye laden extraction solvent is separated as a separate phase from the high-boiling, nonionic liquid medium.
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