Kanzaki Paper Manufacturing Co., Ltd.

Kazuko Hirahara

Mitsuru Kondo

Nobuo Kanda

In a heat-sensitive recording material comprising a colorless or pale-colored basic dye and an electron accepting reactant material which is reactive with the basic dye to form a color when contacted therewith, and comprising at least one of the specific phthalide derivatives as the basic dye, the heat-sensitive recording material characterized in that at least one compound selected from the group consisting of the specific fluorene derivatives and the specific p-phenylenediamine derivatives is further contained in the recording material.

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Amagasaki, Japan

Kazuko Hirahara