Bayer Aktiengesellschaft

Wolfgang Bockelman

Hans Niederprum

In the chrome-tanning of skins with a chromium (III) salt and an acid-binding agent, the improvement which comprises effecting the chrome-tanning in the presence of a water-soluble partial ester of a polycarboxylic acid containing 4 to 11 carbon atoms which ester hydrolyzes into the free acid or its salt. The partial ester is advantageously present in about 0.5 to 2, preferably 1,3 to 1.8, times the molar amount of the chromium salt expressed as Cr.sub.2 O.sub.3. The tanning composition can be formed by dissolving the desired ingredients and the solution spray dried to provide a properly formulated powder which can thereafter by employed to re-formulate the solution.

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Leverkusen, Germany

Wolfgang Bockelman