Multi-color heat-sensitive recording material utilizing multiple

Abstract

A multi-color heat-sensitive recording material is disclosed which comprises a support having laminated thereon in the following order a first heat-sensitive color forming layer comprising mainly an electron donating dye precursor and an electron accepting compound, a second heat-sensitive color forming layer containing a diazonium salt compound having a maximum absorption wavelength of 360.+-.20 nm and a coupler capable of reacting with the diazonium salt compound by heating to form color and a third heat-sensitive color forming layer containing a diazonium salt compound represented by formula (I) having a maximum absorption wavelength of 400.+-.20 nm and a coupler represented by formula (II) capable of reacting with the diazonium salt compound by heating to form color: ##STR1## wherein R.sub.1 and R.sub.2 each represents an alkyl group, an aralkyl group or an aryl group; Y represents a halogen atom, an acyl group, an alkoxycarbonyl group or a sulfamoyl group; and X.sub.1.sup.- represents a counter anion: ##STR2## wherein R.sub.3 represents an alkyl group or an aryl group; R.sub.4 represents an alkyl group, an aryl group or an aralkyl group; R.sub.5 represents an alkyl group, an alkoxy group, an aryloxy group, an aralkyloxy group, an alkylthio group, an arylthio group, an aralkylthio group or a halogen atom; and n represents 0 or an integer of 1 to 4.