Reactive dyes of the dioxazine series

A reactive dye of the formula ##STR26## in which (R).sub.n stands for n substituents R which, independently each other, are C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, halogen, carboxyl, carbamoyl, N-C.sub.1-4 -alkylcarbamoyl, N,N-di-C.sub.1-4 -alkylcarbamoyl, C.sub.1-4 -alkylsulfonyl, sulfamoyl, N-C.sub.1-4 -alkylsulfamoyl or N,N-di-C.sub.1-4 -alkylsulfamoyl, n is 0 to 2, m is 1 to 2, one X is an H.sub.2 N group and the other X is a radical of the formula ##STR27## in which R.sub.1 and R.sub.2 are independently of each other hydrogen or C.sub.1-4 -alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano, sulfo or sulfato, A is C.sub.2-4 -alkylene which is unsubstituted or substituted by halogen, hydroxyl, carboxyl, sulfo, phenyl, sulfophenyl or C.sub.1-4 -alkoxycarbonyl, or is cyclohexylene which unsubstituted or substituted by C.sub.1-4 alkyl, or in which the group --N(R.sub.1)--A--N(R.sub.2)--is 1,4-piperazinediyl, and Y is a radical of the formula ##STR28## wherein Z is methoxy, isopropoxy, --NH.sub.2, and N-C.sub.1 -C.sub.6 -alkylamino, N,N-di-C.sub.1 -C.sub.6 -alkylamino, cyclohexylamino, benzylamino, phenethylamino, phenylamino, naphthylamino, N-C.sub.1 -C.sub.6 -alkyl-N-cyclohexylamino, N-C.sub.1 -C.sub.6 -alkyl-N-phenylamino, furanylamino. thiophenylamino, pyrazolylamino, pyridylamino, pyrimidinylamino, quinonylamino, benzimidazolylamino, benxthiazolylamino or benzoxazolylamino radical or the radical of a 6-membered N-heterocyclic compound which can contain nitrogen, oxygen and sulfur as further heteroatoms, all of which radicals mentioned above are unsubstituted or substituted by halogen, nitro, cyano, trifluoromethyl. sulfamoyl, carbamoyl, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, acetylamino, ureido, hydroxyl, carboxyl, sulfomethyl or sulfo, or Y is a chlorotriazine radical which is substituted by --NH.sub.2, .beta.-sulfatoethylamino, .beta.-hydroxyethylamino, N,N,di-.beta.-hydroxyethylamino, phenylamino, N-ethyl-N-phenylamino, m-sulfophenylamino, p-sulfophenylamino, 2,5-disulfophenylamino, morpholino, methoxy or isopropoxy, or is a 2,4-difluoropyrimid-6-yl or 2,4-difluoro-5-chloro-pyrimid-6-yl radical.