Basf Aktiengesellschaft

Basf Se Corporation

Stefan Schroeder

Stephan Hueffer

Gunther Pabst

Tilman Luedecke Taeger

Volker Bach

Philippe Lamalle

Thorsten Raedler

Guenter Scherr

Walter Gramlich

Günter Scherr

Kathrin Michl

Stephan Hüffer

Gerhard Wolf

Oliver Reese

Tilman Ludecke Taeger

Juergen Carle

Karl Vill

Einhard Wagner

A formulation for use in chrome-free or chrome tanning is proposed, comprising a clay mineral which, after vigorous stirring for 30 minutes in water at 50&#xb0; C., has a number average particle diameter of less than 2 &#x3bc;m or a bimodal 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, the amount of the first, finely divided fraction being from 10 to 90% by weight, and one or more substances from one or more of the following groups: organic polymers, aldehyde tanning agents, sulfone tanning agents, resin tanning agents, phenol tanning agents, fatliquoring agents, vegetable tanning agents, dyes and pigments.

Formulation for use in chrome or chrome-free tannage

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

Adducts are obtained by reacting carbonyl compounds of the formula I where Rand Rare as defined, with cyclic compounds of the formula II where X is selected from oxygen, sulfur and N&#x2014;R, R-Rare as defined, and n is an integer from 1 to 4, which adducts are useful as tanning agents and preservatives.

Adducts based on cyclic compounds and the use thereof as tanning agents and curing agents

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 present invention relates to C&#x2013;C-polymercaptopolyols as regulators in the free-radically initiated solution and precipitation polymerization of ethylenically unsaturated monomers.

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Neuleiningen, Germany

Stefan Schroeder