- Disperse dyes which are convertible into a thermo-migration fast form
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The dyes according to the invention consist of a chromophore and a radical which, on heating, forms an isocyanate or isothiocyanate group. The latter reacts with a suitable group in the environment. Dyeings of excellent thermomigration fastness are obtained. The disclosed dyes are of the formulae STR1 where F is the radical of an azo, anthraquinone or tricyanovinyl dye which is free of water-solubilizing groups, B and B' are each independently of the other a direct bond or a bridge member, selected from the group consisting of a straight-chain or branched alkylene group having 2 to 8 C atoms or one of the following groups STR2 where R is hydrogen or C1 -C6 alkyl, n is an integer from 1 to 8 and m is an integer from 2 to 4, Z is O or S, V is a group which at a temperature between 180° and 240° C. is eliminated as a radical HV, and V' is a direct bond which is cleaved at a temperature between 180° and 240° C. or is a group which at such temperature turns, by ring opening and cleavage of the bond V'-C, into a group V'H, with the provisos that in the azo dyes the diazo component is not aminobenzisothiazole and the coupling component is not N-(β-phenylureidoethyl)-1-naphthylamine when the diazo component is 2,4-dinitro-6-bromoaniline.
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