| abstract |
Disperse dyes, which produce dyeings of excellent thermomigration fastness, consisting of a chromophore and a lactam or oxime radical which detaches on heating to leave an isocyanate or isothiocyanate group, which reacts with a suitable group in the environment. The disclosed dyes are described by the formula <IMAGE> (1) where F is the radical of a dye which is free of water-solubilizing groups, B is a bridge member or a direct bond, Z is O or S and V is the radical of a group H-V, where H-V is an oxime of the formula <IMAGE> (2) or a lactam of the formula <IMAGE> (3) in which R1 and R2 are each independently of the other substituted or unsubstituted alkyl or aryl, or R1 and R2 together with the carbon atom linking them form a cycloaliphatic ring, R is hydrogen or alkyl and n is an integer from 4 to 11. |