Fuji Photo Film Company, Limited

Tatsuo Kawabuchi

Kimiatsu Nomura

Hisato Nagase

Hiroshi Sato

Yoshihiro Jimbo

Tetsunori Matsushita

Masanobu Takashima

Naoto Yanagihara

Toshihide Aoshima

Akinori Fujita

Mitsuyuki Tsurumi

Kimi Ikeda

Yasuhiro Mitamura

Hisao Yamada

Yohsuke Takeuchi

Satoshi Higuchi

Kazunori Nigorikawa

Yoshihiro Jinbo

A diazonium salt represented by the following general formula (1) and a thermal recording material using the diazonium salt: General Formula (1) wherein Rand Reach independently represents an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group or a carbamoyl group, and Rand Rmay be linked each other to form a ring; and Rto Reach independently represents a hydrogen atom, a hydroxyl group, a halogen atom, an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylsulfonyl group, an arylsulfonyl group or a diazonio group, and at least one of R, R, Rand Rrepresents the diazonio group.

Diazonium salt and thermal recording material using the same

Diazonium salt and heat-sensitive recording material

An object of the present invention is to provide a pyrrolo&lsqb;1,2-a&rsqb;pyrimidine compound that is useful as a coupler providing excellent hue of a cyan system and sufficient density of formed color. The pyrrolo&lsqb;1,2-a&rsqb;pyrimidine compound of the present invention for achieving the object is represented by one of following general formulae (1), (2) and (3).

Pyrrolo&lsqb;1,2-a&rsqb;pyrimidine compound and heat-sensitive recording material using the same

A hydrazone dye is provided which forms cyan color having an excellent hue. The hydrazone dye is expressed by the following general formula (I):

Hydrazone dye

Disclosed is a heat-sensitive recording material comprising a substrate having thereon a heat-sensitive recording layer containing a diazonium salt compound and a coupler, pyrrolo�1,2-a! pyrimidine compound, as the coupler, being represented by the following general formula (1): ##STR1## wherein R.sup.1 to R.sup.4 each represents a hydrogen atom, a halogen atom, an aryl group, an alkyl group, a cyano group, an acyl group, a substituted carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyloxy group, an alkoxy group, an aryloxy group, an alkylthio group, or an arylthio group. The diazo-type heat-sensitive recording material, which develops a violet to cyan color, has excellent image stability and image fixing characteristics.

Heat-sensitive recording material

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Shizuoka-ken, Japan

Tatsuo Kawabuchi