METHOD FOR PRODUCING LEATHER

WIPO Patent Application WO2004037589

A3

The invention relates to a method for producing leather, comprising at least two of the following method steps A) to D): A) using one or more polyelectrolytes during the production of semifinished or intermediate products, involving the addition of one or more polyelectrolytes in at least one of steps (a) to (d): (a) together with 0 to 1.5 % by weight of lime, with regard to the weight of salt, immediately before or in the lime pit; (b) before or during deliming; (c) before or during bating; (d) together with, in total, 0 to 3 % by weight of alkaline salt or alkaline earth salt, with regard to the pelt weight, immediately before or in the pickle solution; B) in the lime pit, treating the skins in an aqueous liquor with one or more compounds of general formula (B.1) or with their corresponding alkali metal salts, alkaline earth metal salts, ammonium salts or phosphonium salts, whereby variables R<10> and X<1> to X<4> have the meanings as cited in the description, with the provision that at least two mercapto groups are contained in the compound or compounds B.1; C) using degreasing agents of general formula (C.1) for degreasing pelts, skins or other intermediate stages and semifinished products during the production of leather, whereby variables n and R<16> to R<21> have the meanings as cited in the description; D) tanning by using a tanning agent that can be produced by reacting at least one aldehyde of general formula (D.1) with at least one other identical or different aldehyde of formula (D.1) in the presence of an acid catalyst and, optionally, in the presence of at least one additional carbonyl compound of formula (D.2), whereby variables Z and R<22> to R<25> have the meanings as cited in the description, with the provision that, in the event Z corresponds to a chemical single bond or to a radical without alpha -hydrogen atoms, at least one additional aldehyde of formula (D.1), in which radical Z contains alpha -hydrogen atoms, or at least one additional carbonyl compound of formula (D.2) is present. The invention also relates to leather that is produced according to the inventive method.

WO/1996/019590	METHOD FOR DEHAIRING OF HIDES OR SKINS BY MEANS OF ENZYMES
JP2002521525	INDUSTRIAL APPLICABILITY: Hair removal paint thickener
WO/2001/042513	ENZYMATIC UNHAIRING AGENT FOR USE IN TANNING FOR PRODUCING LEATHER AND METHOD FOR ENZYMATIC UNHAIRING TREATMENT

TAEGER TILMAN LUEDECKE (DE)
PABST GUNTHER (DE)
LAMALLE PHILIPPE (DE)
HUEFFER STEPHAN (DE)
SCHROEDER STEFAN (DE)

PCT/EP2003/011368

June 24, 2004

October 14, 2003

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BASF AG (DE)
TAEGER TILMAN LUEDECKE (DE)
PABST GUNTHER (DE)
LAMALLE PHILIPPE (DE)
HUEFFER STEPHAN (DE)
SCHROEDER STEFAN (DE)

C14C1/06; (IPC1-7): C14C3/16; C14C1/08

DE3203074A1	1983-08-04
DE3811267C1	1989-05-18
DE2215948A1	1973-10-11

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