Bichromophoric methine and azamethine dyes and process for transferring them

Claim 1

A bichromophoric dye of the formula I Z.sup.2 --Z.sup.1 --L--Y.sup.1 --Y.sup.2 (I) where L is a bridge member which does not permit any conjugation of π-electrons between Z 1 and Y 1 , said bridge member having the formula --E.sup.1 --D--E.sup.2 -- where D is a chemical bond, oxygen, --SO 2 --, --O--CO--O--, 1,4-cyclohexylene, phenylene, --O--CO--(CH 2 ) 1 --CO--O, --O--(CH 2 ) m --O--, ##STR83## where 1 is from 1 to 10 and m is from 2 to 10, ##STR84## E 1 and E 2 are identical or different and each is independently of the other a chemical bond or C 1 -C 15 -alkylene, Z 1 and Y 1 are identical or different and, together with the bridge member L, each is independently of the other a radical of the formula ##STR85## where R 1 and R 5 are identical or different and each is independently of the other alkyl, alkoxyalkyl, alkoxycarbonylalkyl or alkanoyloxyalkyl, which may each have up to 10 carbon atoms and be hydroxyl- or cyano- substituted, hydrogen, benzyl, cyclohexyl, phenyl or tolyl, R 2 and R 3 are identical or different and each is independently of the other hydrogen, C 1 -C 8 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkanoylamino or C 1 -C 6 -alkylsulfonylamino, Z 2 and Y 2 are identical or different and each is independently of the other a radical of the formula ##STR86## where R 7 is C 1 -C 6 -alkoxycarbonyl, C 1 -C 6 -monoalkylcarbamoyl, C 1 -C 6 -monoalkylsulfamoyl, C 1 -C 6 -alkanoylamino or C 1 -C 6 alkylsulfonylamino, wherein alkyl may in each case be interrupted by 1 or 2 oxygen atoms, or C 5 -C 7 -cycloalkoxycarbonyl, C 5 -C 7 -monocycloalkylcarbamoyl, C 5 -C 7 -monocycloalkylsulfamoyl, C 5 -C 7 -cycloalkylcarbonylamino, phenoxycarbonyl, monophenylcarbamoyl, monophenylsulfamoyl, benzoylamino, phenylsulfonylamino, methylphenylsulfonylamino, fluorine or chlorine, R 8 is C 1 -C 8 -alkyl, C 1 -C 6 -alkanoylamino or C 1 -C 6 -alkylsulfonylamino, wherein alkyl may in each case be interrupted by 1 or 2 oxygen atoms, or C 5 -C 7 -cycloalkylcarbonylamino, C 5 -C 7 -cycloalkylsulfonylamino, benzoylamino, phenylsulfonylamino, hydrogen, fluorine or chlorine.