| abstract |
The invention concerns azo dyes of formula (I) in which D stands for a diazo component group from the aniline series or from the aromatic heterocyclic amine series, R<1> and R<2> designate C1-C10 alkyl, which is optionally substituted, C5-C7 cycloalkyl, C3-C4 alkenyl, optionally substituted phenyl, or R<1> and R<2> together with the nitrogen atom bonding them designate a heterocyclic group, and R<3> designates tert-butyl or tert-pentyl. The invention further concerns a process for thermally transferring these dyes, and their use for colouring or printing synthetic materials. |