Tfl Ledertechnik Gmbh

Nina Schulte

Jens Fennen

Catherine Gabagnou

Grigore Daniel Herta

Eric Kientz

Florian Döppert

A composition including an acetal of an aldehydic tanning agent for tanning hides and/or pelts, as well as a method for tanning hides and/or pelts in order to produce leather, wherein an acetal of an aldehydic tanning agent is used. By reducing the pH, the aldehydic tanning agent can be released, whereby a tanning step is initiated. The composition and the method are characterized by lower toxicity compared to conventional compositions and tanning methods based on aldehydic tanning agents. Furthermore, improved penetration of the tanning agents into deeper layers of the hide and/or the pelt is possible, so that particularly homogeneous tanning is achieved.

Tanning composition and method based on an acetal of an aldehydic tanning agent

The present invention is directed to a process for retanning leather comprising the steps of: a) providing tanned or pre-tanned leather b) treating the tanned leather of step a) with a composition comprising hollow microspheres, preferably as an aqueous composition, the hollow microspheres have a true density of from 0.01 to 0.10 g/cm(25&#xb0; C.) and/or a bulk density of the dry powder of 0.005 to 0.06 g/cm(25&#xb0; C.), c) drying, whereby the temperature of the leather during drying does not exceed 75&#xb0; C. as well as to leather obtained by said process.

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Freiburg, Germany

Nina Schulte