Dyeing process using a sequestrating agent
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United States of America Patent
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-
Nov 4, 1980
Issued Date -
N/A
app pub date -
Apr 24, 1979
filing date -
Jul 23, 1976
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Dyeing with a dyestuff containing a metal or from a bath in the presence of one or more metallic elements, especially alkaline-earth or heavy metals, is carried out in the presence of a sequestrating agent or sequestrant. According to the invention the sequestrant is a derivative of a phosphonic acid having no effect on the physical-chemical characteristics of the dyestuff which is used and is preferably a salt of a hydroxy-lower-alkane-phosphonic acid.
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