Pressure- or heat-sensitive recording material and novel chromano compounds used therein

摘要

A pressure- or heat-sensitive recording material which contains as color former at least one chromano compound of the general formula wherein X1, X2, Z1 and Z2, each independently of the other, represent the group of the formula in which V1 and V2, each independently of the other, represent hydrogen, halogen, lower alkyl or lower alkoxy, and Y1 and Y2, each independently of the other, represent hydrogen, -O-R1 or and the ring A is unsubstituted or substituted by halogen, nitro, lower alkyl, -O-R3 or or contains a fused benzene ring, while R1, R2, R3 and R4, each independently of the other, represent hydrogen, alkyl of not more than 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or represent cycloalkyl, phenyl, benzyl, or phenyl or benzyl which is substituted by halogen, nitro, lower alkyl or lower alkoxy, or each of the pair of substituents R1 and R2 and R3 and R4, together with the nitrogen atom to which said pair is attached, independently represents a 5- or 6-membered heterocyclic radical.