Tanning agent and process
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United States of America Patent
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Oct 16, 1990
Grant Date -
N/A
app pub date -
Feb 2, 1989
filing date -
Feb 6, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A leather tanning agent for use as a sole tannage or with another includes Al (III) ions, Ti (IV) ions and an organic masking agent in specific proportions. The ratio of Ti:Al expressed as metal oxides TiO.sub.2 :Al.sub.2 O.sub.3 on a weight basis is from 0.6:1 to 2:1 and the amount of masking agent is from 0.1 to 0.4 mole per mole of total metal oxides. Preferably SO.sub.4 ions are present. Other metal tanning agents such as zirconium salts can be incorporated. The tanning agent finds wide use and has an increased stability.
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