Bis-triazinyl-amino)-stilbene-disulfonic acid derivatives

A compound of the formula ##SPC2##

• in which
• X is --CO--R.sub.2, --SO.sub.2 --R.sub.3, CO--O--R.sub.3, --CO--NH--R.sub.2 or --CS--NH--R.sub.2,
• Y is --CO--R.sub.3 or R.sub.4, or, if X is --CO--R.sub.2,
• Y and R.sub.2 together form a chain of 3 to 5 carbon atoms which chain consists of the following ring members:
• a groups of the formula --CH.sub.2 --,
• b groups of the formula --CH=CH--,
• c groups of the formula ##SPC3##
• and
• d groups of the formula -CO-, wherein
• a is an integer of zero to 5,
• b is an integer of zero to 2 and
• c and d are zero or 1, with the proviso that a is more than 3 if b, c and d all are zero,
• R.sub.1, r.sub.2 and R.sub.4 are hydrogen, alkyl of 1 to 20 carbon atoms, cycloalkyl of 4 to 8 carbon atoms or phenyl,
• R.sub.3 is alkyl or 1 to 20 carbon atoms, cycloalkyl of 4 to 8 carbon atoms or phenyl,
• A is alkylene of 2 to 6 carbon atoms,
• Z is chlorine or a group of the formula
• --NR.sub.5 R.sub.6 or --O--R.sub.7,
• wherein
• R.sub.5 is hydrogen, alkyl or alkenyl of up to 20 carbon atoms, cycloalkyl of 4 to 8 carbon atoms or phenyl,
• R.sub.6 is hydrogen or lower alkyl, or
• R.sub.5 and R.sub.6 together with the nitrogen to which they are bound are pyrrolidino, piperidino, hexamethyleneimino or morpholino,
• R.sub.7 is lower alkyl or phenyl and
• M is hydrogen or a colorless cation,
• which groups R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are unsubstituted or substituted by non-chromophoric radicals selected from the group consisting of lower alkyl, lower alkenyl, lower alkoxy, lower alkanoyl, benzoyl, halogen, amino, lower alkylamino, di-lower-alkyl-amino, tri-lower-alkylammonium, hydroxy, lower alkanoyloxy, benzoyloxy, lower alkanoylamino, benzoylamino, carboxy, lower carboalkoxy, carbamoyl, mono- and di-N-(lower alkyl) carbamoyl, cyano, sulfo, sulfonic acid lower alkyl ester, sulfonic acid amide, sulfonic acid mono- and di-N-(lower alkyl) amide and phenyl.