Process for retanning mineral tanned leathers with aromatic sulphonic acids
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United States of America Patent
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Oct 4, 1994
Issued Date -
N/A
app pub date -
Mar 29, 1993
filing date -
Aug 10, 1990
priority date (Note) -
Expired
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Abstract
Process for retanning mineral-tanned leathers, characterised in that the retanning agents used are sulphonic acids and/or salts thereof of the general formula ##STR1## wherein R represents hydrogen, --CH.sub.3 or the radicals ##STR2## X represents hydrogen, an alkali metal ion, especially sodium, potassium or lithium ion, or an ammonium ion and n represents 1, 2, 3 or 4.
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