Patent ID: 6197725
Filing Date: 2001-03-06
Classification: G03C

Abstract:
A heat-sensitive recording material comprising a substrate carrying thereon a heat-sensitive recording layer containing a diazonium salt compound and a coupler which develops color by reacting with said diazonium salt compound in heating, wherein said coupler comprises at least one compound represented by the following general formula (1): ##STR27##wherein Y represents a carbon atom or sulfur atom, Z represents an oxygen atom or sulfur atom, R represents an alkyl group, aryl group, heterocyclic group, alkoxy group, aryloxy group or amino group, n1 represents 1 when Y is a carbon atom and represents 1 or 2 when Y is a sulfur atom, when n1 represents 2, two Zs may be the same or different, X.sub.1, X.sub.2 and X.sub.3 each independently represents an atom group required for forming a 5-membered aromatic heteroring wherein there is no case in which two of X.sub.1, X.sub.2 and X.sub.3 represent a carbon atom and the remaining one represents a nitrogen atom.