Method for removing horn substance from skins, pelts or furs
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United States of America Patent
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Jul 29, 2008
Grant Date -
Oct 20, 2005
app pub date -
May 19, 2003
filing date -
May 22, 2002
priority date (Note) -
Expired
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Abstract
Horny substances are removed from hides, pelts or skins of dead animals by treating the hides, pelts or skins in aqueous liquor with one or more compounds of the formula I ##STR00001## or their corresponding alkali metal or alkaline earth metal salts or ammonium or phosphonium salts, the variables being defined as follows: R.sup.1 is selected from hydrogen and C.sub.1-C.sub.12-alkyl, unsubstituted or substituted by one or more S--H or O--H groups; X.sup.1 to X.sup.4 are identical or different and are selected from hydrogen, C.sub.1-C.sub.4-alkyl, O--H, S--H and N--HR.sup.2, R.sup.2 is hydrogen or C.sub.1-C.sub.12-alkyl or a C.sub.1-C.sub.4-Alkyl-C.dbd.O group, at least one radical X.sup.1 to X.sup.4 being S--H when R.sup.1 contains at least one sulfur atom and at least two radicals X.sup.1 to X.sup.4 being S--H when R.sup.1 contains no sulfur atom.
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