Benzothioxanthene dyes, their preparation and their use

A benzothioxanthene dye of the formula I ##STR12## in which R.sup.1 is SO.sub.3.sup..crclbar. M.sup..sym. or SO.sub.2 NR.sup.4 R.sup.5 ;

• R.sup.2 and R.sup.3 independently of one another are hydrogen, SO.sub.3.sup..crclbar. M.sup..sym. or SO.sub.2 NR.sup.4 R.sup.5 ;
• R.sup.4 is hydrogen, (C.sub.1 -C.sub.22)-alkyl, (C.sub.3 -C.sub.7)-cycloalkyl, aryl, heteroaryl, aryl-(C.sub.1 -C.sub.6)-alkyl, hydroxy-(C.sub.1 -C.sub.4)-alkyl or carboxy-(C.sub.1 -C.sub.4)-alkyl;
• R.sup.5 is hydrogen, (C.sub.1 -C.sub.22)-alkyl, (C.sub.3 -C.sub.7)-cycloalkyl, aryl-(C.sub.1 -C.sub.6)-alkyl, hydroxy-(C.sub.1 -C.sub.4)-alkyl, dihydroxy-(C.sub.1 -C.sub.4)-alkyl, carboxy-(C.sub.1 -C.sub.4)-alkyl, dicarboxy-(C.sub.1 -C.sub.6)-alkyl, (amino)-(carboxy)-(C.sub.1 -C.sub.6)-alkyl, sulfo-(C.sub.1 -C.sub.6)-alkyl, amino-(C.sub.1 -C.sub.6)-alkyl, (C.sub.1 -C.sub.4)-alkylamino-(C.sub.1 -C.sub.6)-alkyl, (di-((C.sub.1 -C.sub.4)-alkyl) amino)-(C.sub.1 -C.sub.6)-alkyl or the residue of an amino acid which is formally obtained by removing the amino group from the amino acid molecule,
• or R.sup.4 and R.sup.5, together with the nitrogen atom to which they are attached, form a 5- to 7-membered heterocyclic ring;
• M.sup..sym. is a cation;
• X is hydrogen, chlorine or bromine;
• Y is hydrogen, chlorine, (C.sub.1 -C.sub.4)-alkyl or (C.sub.1 -C.sub.4)-alkoxy;
• and
• n is 0, 1 or 2.