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 C.sub.1 -C.sub.6 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.degree. and 240.degree. C. is eliminated as a radical HV, and V' is a direct bond which is cleaved at a temperature between 180.degree. and 240.degree. 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-(.beta.-phenylureidoethyl)-1-naphthylamine when the diazo component is 2,4-dinitro-6-bromoaniline.
本发明的
染料由色团和基团组成,在加热时形成
异氰酸酯或异
硫氰酸酯基团。后者与环境中的适当基团发生反应。获得了具有优异热迁移牢度的染色。所披露的
染料的公式为##STR1##其中F是不含
水溶性基团的偶氮、
蒽醌或三
氰基
乙烯染料的基团,B和B'是各自独立的直接键或桥接成员,选自具有2至8个碳原子的直链或支链烷基或以下任一组的成员##STR2##其中R为氢或C.sub.1-C.sub.6烷基,n为1至8的整数,m为2至4的整数,Z为O或S,V为在180℃至240℃之间的温度下作为基团HV消失的基团,V'为在180℃至240℃之间的温度下断裂的直接键或在这样的温度下通过环开启和键V'-C的断裂转变为基团V'H的基团,但偶氮
染料中的重氮组分不是
氨基
苯并噻唑,偶联组分不是N-(.beta.-苯基
脲基乙基)-
1-萘胺,当重氮组分为2,4-二硝基-6-
溴苯胺时。