| abstract |
A diazotype heat development recording medium of the present invention has excellent shelf life and heat sensitivity. The medium comprises a support and a recording layer which is formed on said support and which comprises a diazo compound, a coupler, an acid stabilizer, a thermal developer, and a polymeric binder. The thermal developer is a salt of an organic or inorganic acid having a primary dissociation constant of 2x10-1 to 1x10-4 and an alkyl-substituted guanidine represented by the general formula: <IMAGE> (wherein at least one of R1 and R2 is an alkyl group of C8 to C24, and the other of R1 and R2 is a hydrogen atom or an alkyl group of C1 or more). |