Pressure-sensitive recording materials

Abstract

A pressure-recording process in which a methine dye is produced by bringing image-wise into reactive contact with the aid of pressure, a compound reacting as an acid with a dye precursor compound corresponding to the following general formula: ##EQU1## wherein: R.sub.1 represents (1) an aryl group substituted with an ether group R.sub.6 --O-- in which R.sub.6 represents a hydrocarbon group or (2) a heterocyclic group; R.sub.2 represents (1) an aryl group substituted with an ether group R.sub.6 --O-- in which R.sub.6 represents a hydrocarbon group, (2) a heterocylic group or (3) a ##EQU2## group, in which Z represents the necessary atoms to close a heterocylic nucleus, R.sub.3 represents (1) a --XH or --X--R.sub.7 group, in which X is oxygen or sulfur, and R.sub.7 is an organic group, (2) a ##EQU3## group in which each of R.sub.8 and R.sub.9 (same or different) represents hydrogen or an alkyl group, a cycloalkyl group, an aralkyl group, or an aryl group, or R.sub.8 and R.sub.9 together represent the necessary atoms to close a nitrogen-containing heterocyclic nucleus, or (3) a ##EQU4## group IN WHICH R.sub.10 represents an alkyl group or a cycloalkyly group, an aralkyl group, an aryl group or a heterocyclic group and R.sub.11 represents hydrogen or a group emumerated in the definition of R.sub.10, or R.sub.11 and R.sub.10 together represent sultam group, Each of R.sub.4 and R.sub.5 (same or different) represents hydrogen, a C.sub.1 - C.sub.5 alkyl group, a cycloalkyl group, an aralkyl group or an aryl group, n is 0 or 1, and m is 0 or 1.

Dependencies are inferred from the claim text.