Use of certain quaternary ammonium compounds in dyeing leather with basic dyestuffs
AssigneeSandoz Ltd.
InventorHans-Peter Baumann
Life of this patent
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Abstract
Leather, hides, skins or fur-skins are treated before and/or during dyeing with basic dyes, with a compound of formula I ##STR1## in which R.sub.1 is a C.sub.8-18 aliphatic residue; each R.sub.2, independently, is C.sub.1-4 alkyl; R.sub.3 is a C.sub.1-18 aliphatic residue or --CH.sub.2 -R.sub.4 where R.sub.4 is phenyl; phenyl substituted by up to two substituents selected from the group consisting of chlorine, bromine, methyl, methoxy and ethoxy; or naphthyl; and X is an anion, or a mixture thereof. Dyeings with improved levelness and reproducibility are thus obtained.
Claims30
A method for dyeing a substrate selected from the group consisting of leather, hides, skins and furskins which comprises the steps of
- A. applying to the substrate a compound or mixture of compounds of formula I ##STR8## in which R.sub.1 is a C.sub.8-18 aliphatic residue;
- each R.sub.2, independently, is C.sub.1-4 alkyl;
- R.sub.3 is a C.sub.1-18 aliphatic residue or --CH.sub.2 R.sub.4 where R.sub.4 is phenyl;
- phenyl substituted by up to two substituents selected from the group consisting of chlorine, bromine, methyl, methoxy and ethoxy;
- or naphthyl;
- and
- X is a non-chromophoric anion, and
- B. dyeing the substrate with a basic dyestuff selected from the group consisting of polycationic dyestuffs having at least 1.3 cationic groups per dyestuff molecule and cationic zeo dyestuffs containing at least one component residue derived from a further substituted 6-hydroxy-2-pyridone,
- said step A being carried out before or during said step B and the amount of compound of formula I being effective to improve the levelness of the dyeing with the basic dyestuff.
A method for dyeing a subtrate selected from the group consisting of leather, hides, skins and furskins which comprises the steps of
- A. applying to the substrate a compound or mixture of compounds of formula I ##STR9## in which R.sub.1 is a C.sub.8-18 aliphatic residue;
- each R.sub.2, independently, is C.sub.1-4 allkyl;
- R.sub.3 is a C.sub.1-18 aliphatic residue or --CH.sub.2 --R.sub.4 where R.sub.4 is phenyl;
- phenyl substituted by up to two substituents selected from the group consisting of chlorine, bromine, methyl, methoxy and ethoxy;
- or naphthyl;
- and
- X is a non-chromophoric anion, and
- B. dyeing the substrate with a basic dyestuff selected from the group consisting of polycatonic dyestuffs having at least 1.3 cationic groups per dyestuff molecule and cationic azo dyestuffs containing at least one component residue derived from a further substituted 6-hydroxy-2-pyridone,
- said step A being carried out before and/or during said step B and the amount of compound of formula I being effective to improve the levelness of the dyeing with the basic dyestuff.
Dependencies are inferred from the claim text.