Basf Aktiengesellschaft

Basf Se Corporation

Basf Aktienegesellschaft

Tilman Luedecke Taeger

Gunther Pabst

Stephan Hueffer

Stefan Schroeder

Philippe Lamalle

Joaquim Henrique Teles

Michael Breuer

Volker Bach

Thomas Subkowski

Gerhard Wolf

Hans-Georg Lemaire

Burkhard Kroeger

Thorsten Raedler

Juergen Carle

Holger Buehler

A semifinished leather product is produced from an animal hide by pretanning with the use of a chromium-free tanning agent and of a clay mineral which, after stirring for 30 minutes in water at 50&#xb0; C. at a circumferential rotor speed of from 5 to 25 m/s, has a number average particle diameter of less than 2 &#x3bc;m or a bimodal particle size distribution with a first, finely divided fraction whose number average particle diameter is less than 0.5 &#x3bc;m and a second, coarser fraction whose number average particle diameter is less than 5 &#x3bc;m, determined in each case by the method according to ISO 13320-1, by combined laser light diffraction and light scattering, a proportion of the first, finely divided fraction being from 10 to 90% by weight, and drying of the pretanned animal hide to a water content of from 5 to 45%, based on the total weight of the semifinished leather product.

Method for producing a leather semi-finished product

Mixtures of (A) from 55 to 65 mol % of erythro-dithiol of formula erythro-IV: and and their corresponding alkali metal salts and ammonium salts, are useful for treating animal hides.

Dithiol compositions and methods of treating animal hides using the same

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:

Method for removing horn substance from skins, pelts or furs

Tanning agents can be prepared by reacting at least one aldehyde of formula I, with at least one further identical or different aldehyde of formula I,  

Tanning agent and curing agent based on dialdehydes

The invention relates to a method for removing horn substances from animal skin. The method is characterized in that animal skins are treated in an aqueous bath containing between 0.05 and 5 wt. %, in relation to the weight of the salt, of at least one compound of general formula I or the corresponding alkali metallic salts or alkaline-earth metallic salts thereof or ammonium or phosphonium salts. The aqueous bath also comprises at least one compound which catalyses the hydrolysis of peptide compounds 

Method for removing horn substances from animal skin

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Seeheim-Jugenheim, Germany

Tilman Luedecke Taeger