Abstract:
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.
Abstract:
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.
Abstract:
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.
Abstract:
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,X is --CH.sub.2 --CH.sub.2 -- and/or --CH.sub.2 --CH(CH.sub.3)--,0 to (m-1) of the radicals A are hydrogen,1 to m of the radicals A are benzoyl and/or naphthoyl,1 to m of the radicals A are --CO--CH.dbd.CH--COOM and/or --CO--CH.sub.2 --CH(SO.sub.3 M)--COOM, where M is a cation,R.sup.1, R.sup.2 and R.sup.3 are hydrogen or alkyl of 1 to 14 carbon atoms,R is hydrogen and/or alkyl of 1 to 9 carbon atoms, n is a number from 1 to 150 and m is a number from 2 to 12,The pigment having an average particle size of 50 to 500, preferably 80 to 300, nm. By using these dispersions, which contain the pigments in a very finely divided form, it is possible to obtain thorough penetration of the leather with improved light fastness.