Patent ID: 6177240
Filing Date: 2001-01-23
Classification: G03C

Abstract:
A thermographic recording element having at least one image forming layer and comprising an organic silver salt, a reducing agent, and a nucleating agent of the following formula (1): ##STR112##wherein Z is an aromatic group, a heterocyclic group selected from the group consisting of furan, thiophene, pyrrole, benzofuran, benzothiophene, indole, pyrrolidine, piperidine, morpholine, piperazine, pyrazole, thiazole, pyridine, benzimidazole, carbazole, thiazine, indoline, benzothiazoline, benzopiperidine, and phenothiazine rings, or an amino group substituted with an alkyl group having 1 to 30 carbon atoms in total or an aryl group having 6 to 30 carbon atoms in total,M is a hydrogen atom, silver atom, alkali metal or alkaline earth metal,m is an integer of 1 or 2, m is 1 when M is a hydrogen atom, silver atom or alkali metal, and 2 when M is a alkaline earth metal,n is an integer of 0 or 1, andeach of R.sup.1 and R.sup.2, which may be the same or different, is a hydrogen or a substituent attached to the carbon atom to which Z is attached or R.sup.1 and R.sup.2 may form a cyclic structure with Z which is a non-aromatic, saturated or unsaturated, monocyclic or fused ring, carbocyclic or heterocyclic group.