Process for pickling and pretanning raw hides
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United States of America Patent
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Nov 1, 1994
Grant Date -
N/A
app pub date -
Jan 22, 1993
filing date -
Jan 28, 1992
priority date (Note) -
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Abstract
A process for pickling and pretanning raw hides which comprises (I), pickling a raw hide in an aqueous liquor A which is devoid of salts and contains (a) a reaction product of phenol and a sulfonating agent, the molar ratio of (phenol):(SO.sub.3) being (1):(1.1-2.2), and (II), pretanning the pickled raw hide in the same bath by addition of an aqueous formulation B comprising (b) a reductive saccharide having a dextrose equivalent of 10 to 100, and (c) an aliphatic dialdehyde containing 2 to 8 carbon atoms. The combined one-bath pickling/pretanning process makes it possible to prepare, in treatment baths free from neutral salts and heavy metals, readily shaveable wet white leathers that are suitable for further processing by all conventional tanning methods.
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