| 摘要 |
Chromogenic phthalides of the general formula <IMAGE> (I) wherein R1 and R2 independently of one another denote hydrogen, alkyl, alkenyl, aralkyl, cycloalkyl or aryl or are linked to the ring A or B respectively in the o-position to the nitrogen and then represent the remaining members of a partially or fully hydrogenated heterocyclic 5-membered or 6-membered ring which can contain a further heteroatom from the series O, S, N-R1 or N-R2, X1, X2, X3 and X4 independently of one another denote hydrogen, halogen, alkyl, alkenyl, aralkyl, cycloalkyl, aryl, hydroxyl, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy, alkylmercapto, arylmercapto, aralkylmercapto, alkylsulphonyl, alkoxycarbonyl or nitro or X1+X2, X2+X3 or X3+X4 denote a fused benzene ring, Z1 and Z2 independently of one another represent the remaining members of a partially or fully hydrogenated heterocyclic 5-membered or 6-membered ring which can contain a further heteroatom from the series O, S, N-R1 or N-R2, and, if Z1 and Z2 represent an optionally substituted C-2 or C-3 alkylene chain, one of the members Z1 and Z2 must carry at least one non-ionic substituent, and the cyclic and acyclic radicals as well as the rings A and B can carry further non-ionic substituents customary in dyestuffs chemistry, are used in pressure-copyable and thermoreactive recording materials.
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