US 7,404,826 B2Granted

Method for removing horn substance from skins, pelts or furs

AssigneeBASF SE

InventorsTilman Luedecke Taeger, Gunther Pabst, Philippe Lamalle, Stephan Hueffer, Stefan Schroeder

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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 or their corresponding alkali metal or alkaline earth metal salts or ammonium or phosphonium salts, the variables being defined as follows: R1 is selected from hydrogen and C1-C12-alkyl, unsubstituted or substituted by one or more S—H or O—H groups; X1 to X4 are identical or different and are selected from hydrogen, C1-C4-alkyl, O—H, S—H and N—HR2, R2 is hydrogen or C1-C12-alkyl or a C1-C4-Alkyl-C═O group, at least one radical X1 to X4 being S—H when R1 contains at least one sulfur atom and at least two radicals X1 to X4 being S—H when R1 contains no sulfur atom.

Claims9

Dependent claims

A process for removing one or more horny substances from hide, pelt or skin of a dead animal, wherein the hide, pelt or skin is treated in aqueous liquor comprising one or more compounds of the formula I

or their corresponding alkali metal or alkaline earth metal salts or ammonium or phosphonium salts:
R1 is selected from the group consisting of hydrogen and C1-C12-alkyl, unsubstituted or substituted by one or more S—H or O—H groups;
X1 to X4 are identical or different and are selected from the group consisting of hydrogen, C1-C4-alkyl, O—H, S—H and N—HR2,
R2 is hydrogen or C1-C12-alkyl or a C1-C4-alkyl-C═O group,
at least one radical X1 to X4 being S—H when R1 contains at least one sulfur atom and at least two radicals X1 to X4 being S—H when R1 contains no sulfur atom,
wherein one or more basic alkali metal compounds are added and lime is absent, and wherein said process is carried out at a pH value of from 7 to 14.

3 more elements

Dependencies are inferred from the claim text.