Adeka Corporation

Yamahiko Egami

Koichi Shigeno

Etsuo Tobita

Satoru Kanda

Ryozo Arata

A thermal recording material of the invention contains, as a storability improver, tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane trapping and containing water and/or methanol and having a crystal structure that shows a maximum X-ray diffraction peak at a diffraction angle 2&#x3b8; of 6.58&#xb0; according to X-ray diffraction measurement using an X ray having a wavelength of a Cu&#x2014;K&#x3b1; line. The recording material has improved heat resistance in non-printing sections while maintaining the moisture-and-heat resistance in printing sections. The thermal recording material of the invention has a thermal-recording layer that contains the tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane in an amount of preferably 0.1 to 15% by mass with respect to the thermal-recording layer. The amount of the water and/or methanol trapped and contained in the tris(2-methyl-4-hydroxy-5-t-butylphenyl)butane is preferably 0.1 to 10% by mass in total.

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Tokyo, Japan

Yamahiko Egami