Bayer Aktiengesellschaft

Henricus Slaats

Bruno Bomer

Gunter Sackmann

Bernhard Wehling

Joachim Kochta

Franz Schade

Wilhelm Krummel

Copolymers containing incorporated radicals of long-chain alcohols and neutralized carboxyl groups are suitable as retanning agents for leather. They result in an excellent combination of water repellency, softness and grain tightness.

Softening and waterproofing retanning agents

Process for retanning mineral-tanned leathers, characterised in that the retanning agents used are sulphonic acids and/or salts thereof of the general formula ##STR1## wherein R represents hydrogen, --CH.sub.3 or the radicals ##STR2## X represents hydrogen, an alkali metal ion, especially sodium, potassium or lithium ion, or an ammonium ion and

Process for retanning mineral tanned leathers with aromatic sulphonic

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Leverkusen, Germany

Henricus Slaats