Leather tanning process using aluminium (III) and titanium (IV) complexes
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United States of America Patent
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Jun 26, 1990
Issued Date -
N/A
app pub date -
Oct 13, 1987
filing date -
Oct 24, 1984
priority date (Note) -
Expired
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Abstract
In a leather tanning process, animal skins are treated with a tanning agent comprising an aluminium (III)/titanium (IV) mixed complex with a salt of a polyhydroxymonocarboxylic acid as a masking compound. The masking compound preferably has the general formula: HOCH.sub.2 (CHOH)n CO.sub.2 M wherein M is an alkali metal, and n is 2 to 6. Especially preferred masking compounds are sodium gluconate and sodium glucoheptonate. The same process can be used for a wide range of skins, both as a base tannage and in combination with other tanning processes.
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