| abstract |
A pressure-sensitive and heat-sensitive recording material contains color-forming agents of the formula <IMAGE> wherein R1 denotes hydrogen or a non-ionic radical which is free from amino groups, R2 denotes hydroxyl, alkylamino, dialkylamino, acylamino, aralkylamino, arylamino, a saturated heterocyclic radical, alkoxy, alkenyloxy, aralkoxy, cycloalkoxy, aryloxy, acyloxy or a direct bond to R4, R3 denotes hydroxyl, alkoxy, aralkoxy, alkenyloxy, cycloalkoxy, aryloxy, alkylthio, arylthio or a radical of the formula <IMAGE> wherein R5 and R6 independently of one another denote hydrogen, alkyl, aralkyl, cyloalkyl or aryl or, together with the nitrogen atom, form a ring, or R5 forms a ring with the ring B in the o-position relative to the nitrogen atom, and R4 denotes an aryl radical which is free from amino groups or a heterocyclic radical. |