Tanning agent and curing agent based on dialdehydes
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United States of America Patent
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Apr 8, 2008
Grant Date -
Jun 16, 2005
app pub date -
May 2, 2003
filing date -
May 7, 2002
priority date (Note) -
Expired
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Abstract
Tanning agents can be prepared by reacting at least one aldehyde of formula I, with at least one further identical or different aldehyde of formula I, ##STR00001## where Z is a single chemical bond, unsubstituted or substituted C.sub.1-C.sub.12-alkylene, unsubstituted or substituted C.sub.5-C.sub.12-cycloalkylene or unsubstituted or substituted C.sub.6-C.sub.14-arylene, the reaction being carried out in the presence of an acidic catalyst and in the presence of at least one further carbonyl compound of formula II ##STR00002## where R.sup.1 to R.sup.4, independently of one another, are hydrogen, unsubstituted or substituted C.sub.1-C.sub.12-alkyl, unsubstituted or substituted C.sub.3-C.sub.12-cycloalkyl, unsubstituted or substituted C.sub.7-C.sub.13-aralkyl or unsubstituted or substituted C.sub.6-C.sub.14-aryl, with the proviso that, where Z is a single chemical bond or a radical without a-hydrogen atoms, at least one further aldehyde of the formula I, in which Z contains .alpha.-hydrogen atoms, or at least one further carbonyl compound of formula II is present.
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