Processes for preparing and using tanning agents and preservatives
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United States of America Patent
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Oct 16, 2007
Grant Date -
Mar 16, 2006
app pub date -
Jan 22, 2004
filing date -
Jan 28, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the preparation of aqueous formulations, and aqueous formulations so prepared, the process comprising heating at least one cyclic compound of the formula I ##STR00001## in the presence of water and of an acidic catalyst and, during or after the heating, H--X--R.sup.3 is at least partially separated off, where, in formula I, X is selected from oxygen, sulfur and N--R.sup.6, R.sup.1-R.sup.6 are as defined, and n is an integer from 1 to 4.
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