Bayer Aktiengesellschaft

Hans-Werner Muller

Harro Traubel

Helmut Woynar

Fritz Novotny

Manfred Dietrich

Horst Zapfel

Heinrich Strenger

Gunther Held

Hans J Focks

Karl A Weber

Axel Hummel

Oligourethanes containing both anionic and cationic groups may be used as formulating agents for superior aqueous pigment preparations.

Use of oligourethanes as formulating agents for aqueous pigment

Oligourethanes containing both anionic and cationic groups may be used as forming agents for superior non-aqueous pigment preparations.

Oligourethanes as forming agents for non-aqueous pigment preparations

Leather treatment agent containing a mixture a) of a carboxylic acid

Leather treatment agent and its use

In the finishing of leather by spray application in an electrostatic field it is possible to use highly concentrated solutions if these solutions are sprayed into a solvent atmosphere in the presence of inert gases. The finishing process utilizes a solvent atmosphere which has a solvent content of 15-90% of the saturation concentration and a residual oxygen content of less than 10% by volume. The finishes contained are immediately stackable. By working with concentrated solutions it is possible to recycle the solvent from the waste air in an economically acceptable manner.

Process for finishing leather

Leather treatment agents contain a mixture of

Leather treatment agent

Aqueous fatliquoring solutions, dispersions or emulsions are made with (a) polyethers having at least two hydroxyl groups and a molecular weight of from 200 to 20,000 and/or (b) polyester containing at least two hydroxyl groups and a molecular weight of from 200 to 20,000 and/or (c) polycarbonates containing at least two hydroxyl groups and a molecular weight of from 200 to 20,000 and/or mixtures thereof. These fatliquoring agents are used to treat tanned leathers until from 0.1 to 20 wt % has been taken up. The thus-treated leather is particularly useful in the production of leather-polyurethane compositions such as shoes without the use of an adhesive.

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Cologne, Germany

Hans-Werner Muller