| abstract |
Indonaphthol thermal transfer dyes have the formula <IMAGE> where X is nitrogen or the radical CH, R1 and R2 are each independently of the other C1-C6-alkyl, which may be substituted, C1-C6-monooxaalkyl or -dioxaalkyl or allyl, R3 and R4 are each independently of the other hydrogen, C1-C4-alkyl, C1-C4-alkoxy or C1-C4-alkanoylamino, and R5 is five-membered hetaryl which is not benzofused and has two or more hetero atoms, with the proviso that R1 and R2 are not both unsubstituted C1-C6-alkyl at one and the same time. |