Aqueous solutions of synthetic tanning agents
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United States of America Patent
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Nov 23, 1993
Issued Date -
N/A
app pub date -
Jun 3, 1991
filing date -
Jun 6, 1988
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Abstract
Aqueous solutions of synthetic tanning agents comprising (A) a lithium salt of a synthetic, anionic aromatic tanning agent or the anionic non-condensed precursor thereof, and, as optional components, (B) a water-soluble chromium, aluminum, iron or zirconium salt or a mixture thereof, and (C) an alkali metal salt of ethylenediaminetetraacetic acid or of a pyrophosphate are prepared by mixing an aqueous solution of component (A) and optional component (C) with component (B), which may also be in the form of an aqueous solution, and are used as tanning agents for tanning bides or for retanning leather of all kinds. The lithium salts used as component (A) are novel and can be used as stain blockers for polyamide fibres or for enhancing the wetfastness properties of dyeings on polyamide fibres.
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