Basf Aktiengesellschaft

Basf Se Corporation

Rolf Streicher

Dietrich Lach

Ortwin Schaffer

Rolf Fikentscher

Erwin Hahn

Johannes P Dix

Kurt Schneider

Rainer Strickler

Klaus Ebel

Alfred Oftring

Wolfgang Reuther

Gunther Lamm

Matthias Wiesenfeldt

Manfred Herrmann

Horst Belde

Paul Guenthert

Andrea Zamponi

Franz Feichtmayr

Rainer Erhardt

Gerhard Bolz

Laszlo Somogyi

Harald Kiesow

Lothar Hohr

Reiner Erhard

The present invention relates to a process for dyeing leather with at least one dye F which has at least one alkaline-activable group of the formula A; where

Method for the reactive coloring of leather

Dye mixtures containing polyazo dyes and CI Sulphur Black 1 dye

Dyed leather is aftertreated with quaternized condensation products of

Quaternized condensation products for aftertreating dyed leather

Leather is dyed with pigments in an aqueous liquor at from 20.degree. to 60.degree. C. in the presence of an alkoxylated amine of 20 or more carbon atoms.

Dyeing of leather with pigments

A condensate of bis-(4-hydroxyphenyl) sulfone, an aldehyde, a dialdehyde and/or glyoxylic acid and aminoacetic acid or an N-substituted aminoacetic acid is prepared and used as a tanning assistant, in a process for tanning leather in combination with, in particular, aluminum tanning agents.

Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants,

A tanning assistant useful in particular for tanning in combination with aluminum tanning agents is obtained by condensing melamine with glyoxal and/or glyoxylic acid and optionally with an aromatic compound which has a phenolic hydroxyl group or optionally with a condensable nitrogen compound.

Tanning assistant

In a particularly time-saving and economical process for deliming hides, a cyclic ester of sulfurous acid with an aliphatic 1,2-diol is used as the deliming agent.

Deliming of hides and use of cyclic esters of sulfurous acid as deliming

Amphoteric condensates of the general formula I ##STR1## where A is a benzene or naphthyl radical, B is a radical derived from the group consisting of urea, biuret, dicyanodiamide or melamine, or a mixture of these radicals, X is --CH.sub.2 --COOH, CH.sub.3 --CH--COOH, CH.sub.3 --CH.sub.2 --CH--COOH, (CH.sub.3).sub.2 C--COOH or --CH.sub.2 --CH.sub.2 --COOH, R is H, alkyl of 1 to 4 carbon atoms or one of the radicals, X, Y is --CH.sub.2 SO.sub.3 H or --SO.sub.3 H, Z is alkyl of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms, m is from 1 to 10, n is from 0 to 5, p is from 0 to 2, q is from 0 to 2, and o is 4-(p+q) if A is benzene, and is 6-(p+q) if A is naphthyl, and their alkali metal and ammonium salts for retanning, and a process for retanning and dyeing mineral tanned leathers

Amphoteric condensates and their use in retanning

An amino-containing and carboxyl-containing polymer tanning agent containing more carboxyl groups than amino groups, when used for retanning mineral-tanned leather, gives, alone or in combination with conventional anionic retanning agents, leather which is readily dyeable and has good sensory properties.

Carboxyl- and amino-containing copolymer for after-tanning mineral

Water-soluble or self-dispersing resin tanning agents are prepared by heating from 5 to 30% by weight of melamine, from 15 to 45% by weight of urea, from 20 to 35% by weight (calculated as anhydrous material) of formaldehyde and from 15 to 55% by weight of sodium bisulfite or of a corresponding amount of some other salt of sulfurous acid for from two to twelve hours in aqueous solution at 40.degree.-120.degree. C. and a pH of from 5 to 9.

Preparation of water-soluble or self-dispersing resin tanning agents

Conventionally limed hides are delimed for from one to six hours under conventional deliming conditions in respect of liquor length, temperature and pH of the liquor, by a process in which a cyclic carbonate of a polyhydric aliphatic alcohol of 2 to 6 carbon atoms is employed as the active agent.

Deliming hides

An auxiliary for the soaking of hides and skins, which consists of a salt of the formula I

Auxiliary, and process, for the soaking of hides

A process for dyeing grain leather with anionic dyes under the conventional conditions for exhaustion methods, in the presence of two specific surfactants. The combined use of the two surfactants results, in the case of cationically tanned (essentially mineral-tanned) leather, in an improvement in the levelness and dye penetration and in the case of anionically tanned (synthetics-tanned or vegetable-tanned) or retanned leather, in an increase in depth of the color. The two surfactants are

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Worms, Germany

Rolf Streicher