Mordanting

Amides of the general formula (where X is hydrogen, an acyl group R1CO-or a carbalkoxy group R1O.OC-, R1 is an alkyl radical of 1 to 4 carbon atoms and A is a divalent radical of an organic diamine containing at least 8 carbon atoms and including at least one benzene nucleus, a position ortho or para to the OX group being unsubstituted or containing a readily-replaceable group) are prepared by reacting an a -hydroxy-naphthoic acid halide with an organic primary diamine of the above type, preferably in the presence of an acid binding solvent, e.g. pyridine, or by substituting a -hydroxynaphthoic acid chloride for the corresponding sulphonic acid chloride in the reactions described in Specification 577,387, [Group XX]. The radical A may constitute the residue of various organic diamines, e.g. 1,5-diaminonaphthalene, 2,21-, 2,4-, and 4,41-diaminostilbenes, p - diamino - diphenyl ether, benzidine, 1,4-bis-(aminomethyl)-benzene and 1,4 - bis - (b - aminoethyl) - benzene. The radicals may be substituted by hydrocarbon radicals, alkoxy groups, nitro groups, chlorine, bromine, and sulphonic and carboxylic acid groups. A preferred compound for use as a dye mordant is 4,41-bis-(a -naphthol-b -carbonamidophenyl)-ether.ALSO:Fibres and films, e.g. wool, silk, nylon, casein or gelatin, are dyed with a basic dyestuff in the presence of a mordant consisting of a 1- or 2-hydroxy-naphthoic acid amide of the general formula where X is a hydrogen atom, an acyl radical R1CO- or a carbalkoxy group R1O.OC-, R1 is an alkyl group of 1 to 4 carbon atoms and R is an aromatic residue. In one particular form, the compound has the formula where A is the divalent radical of an organic diamine containing at least 8 carbon atoms and including at least one benzene nucleus, a position ortho or para to the OX group being unsubstituted or containing a readily replaceable group. Examples of the radical A are 1,5-diaminonaphthalene, 2,21-, 2,4-, and 4,41-diaminostilbenes, p-diaminodiphenyl ether, benzidine, 1,4-bis-(aminomethyl)-benzene and 1,4-bis-(b -aminoethyl)-benzene. These radicals may be substituted by hydrocarbon radicals, alkoxy groups, nitro groups, chlorine, bromine, and sulphonic and carboxylic acid groups. A preferred mordant is 4,41-bis-(1-naphthol-2-carbonamidophenyl) - ether but 1 - hydroxy-2-naphthoic acid p-chloroanilide, 2,3-hydroxy-naphthoic acid anilide, 1- and 2-hydroxy-naphthoic acid amides and their