Disperse dyes which are convertible into a thermomigration fast form

A disperse dye of the formula ##STR275## where E is D--N.dbd.N-- or ##STR276## wherein D is the radical of a carbocyclic or heterocyclic diazo component selected from the group consisting of thienyl, phenylazothienyl, thiazolyl, isothiazolyl, 1,2,4-thiadiazolyl, 1,3,4-thiadiazolyl, benzothiazolyl, benzisothiazolyl, pyrazolyl, 1,2,3-triazolyl, 1,2,4-triazolyl and imidazolyl, or phenyl, each of these groups being unsubstituted or substituted by alkyl, alkoxy or alkylthio each of 1 to 4 carbon atoms, phenyl, halogen, trifluoromethyl, cyano, nitro, acetyl or benzoyl, carbo-C.sub.1 -C.sub.4 alkoxy, alkyl sulfone of 1 to 4 carbon atoms, phenyl sulfone, phenoxysulfonyl, sulfonamido or phenylazo, or where 2 adjacent substituents on the ring systems mentioned form further fused-on phenyl rings or cyclic imides,

• X is hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen, C.sub.1 -C.sub.4 alkylsulfonylamino or a group of the formula --NH--CO--NHQ, in which Q is hydrogen, C.sub.1 -C.sub.4 alkyl or phenyl, or X is a group of the formula
• --NH--U--R.sup.8 ( 5)
• where U is --CO-- or --SO.sub.2 -- and R.sup.8 is
• a) unsubstituted C.sub.1 -C.sub.12 alkyl or C.sub.1 -C.sub.12 alkyl which is substituted by hydroxyl, C.sub.1 -C.sub.4 alkoxy, halogen, cyano, phenyl, --CO--U or --O--CO--U, where U is C.sub.1 -C.sub.6 alkyl or phenyl or
• b) phenyl or phenyl which is substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, bromine, chlorine, nitro or C.sub.1 -C.sub.4 alkylcarbonylamino,
• Y is hydrogen, halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy-C.sub.2 -C.sub.4 alkoxy,
• R.sup.4 is C.sub.1 -C.sub.12 alkyl, C.sub.2 -C.sub.6 alkenyl or phenyl, or Y and R.sup.4 together with the nitrogen atom and the two carbon atoms linking them form a 5- or 6-membered ring,
• B is a radical of the formula ##STR277## where m is an integer from 2 to 6, Z is O or S and
• V.sup.1 is ##STR278## where R.sup.5 and R.sup.6 are each independently of the other C.sub.1 -C.sub.6 alkyl or R.sup.5 and
• R.sup.6 together with carbon atom linking them form a cyclopentyl, cyclohexyl or cycloheptyl radical,
• R.sup.7 is methyl or hydrogen and
• n' is 4, 5, 6 or 7.

A disperse dye of the formulae ##STR279## where D.sup.1 is a benzothiazolyl radical which is unsubstituted or monosubstituted or disubstituted by chlorine, or is a phenyl radical which is monosubstituted or disubstituted by nitro, chlorine, cyano, methylsulfonyl, ethylsulfonyl or phenylazo,

• X.sup.1 is hydrogen, methyl, methoxy, chlorine, bromine or acetylamino,
• Y.sup.1 is chlorine, methyl, methoxy, methoxyethyl, methoxyethoxy or hydrogen,
• X.sup.2 is hydrogen, methyl, methoxy, chlorine or bromine,
• R.sup.9 is C.sub.1 -C.sub.4 alkyl which is unsubstituted or substituted by hydroxyl, cyano, C.sub.1 -C.sub.4 alkoxy or phenyl,
• B.sup.1 is a radical of the formula ##STR280## where m is an integer from 2 to 6, R.sup.5 and R.sup.6 are each independently of the other C.sub.1 -C.sub.6 alkyl or R.sup.5 and R.sup.6 together with the carbon atom linking them form a cyclopentyl, cyclohexyl or cycloheptyl radical,
• R.sup.7 is methyl or hydrogen, and
• n' is 4, 5, 6 or 7.