Hoechst Aktiengesellschaft

Cassella Aktiengesellschaft

Hoecsht Aktiengesellschaft

Lothar Schlosser

Wolfgang Bauer

Hubert Kruse

Gert Nagl

Rainer Winter

Norbert Munch

Jan-Hilbert Mast

Peter Weinheimer

Gustav Hudec

Jan H Mast

Norbert Ambrecht

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 process for dyeing leather by the exhaust method comprises allowing a pigment dispersion and an aqueous solution of sulfur dye to act on the conventionally pretreated leather in one step or in succession. It affords a high depth of shade and a high brilliance which are not achieved by using the pigment or the sulfur dye on its own.

Dyeing leather: exhaustion process using combination of pigment

The leather is treated with a resin, quaternary ammonium compound, amine or polymer before the impregnation with the fluoro chemicals. With these auxiliaries, a uniform effectiveness of the fluoro chemicals which act on the surface is achieved, regardless of the procedure or the chemicals previously introduced into the leather. These auxiliaries can optionally also be applied to the leather together with the fluoro chemicals.

Processing for rendering leather hydrophobic and oleophobic by

Process for the bath pigmentation of leather, which comprises dyeing the leather with pigment dispersions which contain a compound of the formula (I) ##STR1## where Ar is benzene or naphthalene,

Bath pigmentation of leather

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Frankfurt am Main, Germany

Lothar Schlosser