Hoechst Aktiengesellschaft

Cassella Aktiengesellschaft

Jan-Hilbert Mast

Wolfgang Bauer

Rolf Kleber

Hubert Kruse

Karl Hintermeier

Frank Wehowsky

Gert Nagl

Manfred Muller

Heinrich Bathelt

Werner Lotz

Winfried Ehrl

Lothar Schlosser

Hubert Herdt

Lothar Jackel

Wolfgang Glenz

The present invention relates to a process for dyeing leather by the exhaust method, characterized in that water-insoluble sulphur dyes in dispersed form are used.

Dyeing leather with water-insoluble sulphur dyes

The novel urethanes correspond to the formula I below ##STR1## in which a denotes a number from 5 to 17 and b denotes a number from 1 to 7. These urethanes are prepared by reacting the corresponding perfluoroalkylethanol/epichlorohydrin adducts with toluelene diisocyanates. The novel aqueous dispersions are essentially composed of the novel urethanes, cationic or betaine emulsifiers and non-ionic emulsifiers, water-insoluble carboxylic and/or dicarboxylic acid esters and alkanediols or polyalkanediols which can be etherified on one or both sides, in water. The novel urethanes and the novel aqueous dispersions are used to impart an oleophobic and hydrophobic finish to textiles, leather and furs. They are also suitable for the treatment of unpainted timber, for example unpainted furniture.

Urethanes containing perfluoroalkyl and epichlorohydrin groups

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Hunfelden, Germany

Jan-Hilbert Mast