Process for pickling and pretanning raw hides

Details Process for pickling and pretanning raw hides Process for pickling and pretanning raw hides

1993-01-22

1994-11-01

Willis, Jr., Prince

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9418, 252 857, C14C 316, C14C 108

Patent

active

053604539

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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The New Encyclopedia Britannica, 15th Edition, vol. 6, p. 35, (1986).
Abstract for DE 3308087, Sep. 1984.
Derwent Abstract for JP 57-100,200A, Jun. 22, 1982.
K. Lessen: Leder-Hautemarkt, 36, 14, 39-42 (1984) (month unknown).

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