Nippon Paper Industries Co., Ltd.

Api Corporation

Mai Kaneko

Yukiko Sato

Katsuto Ohse

Yoshimune Aosaki

Provided are a coating solution for a thermosensitive color developing layer of excellent storability wherein color development during its storage or during producing a thermal recording material is suppressed, and a thermal recording material with excellent print portion (image portion) storability and suppressed staining in the background color (white background). A coating solution for a thermosensitive color developing layer, which comprises a colorless or pale-colored electron-donating leuco dye, a hindered phenol compound and, as an electron-accepting developer, a diphenylsulfone derivative represented by the following formula (1): wherein the aforementioned hindered phenol compound has an average particle size (D50) of not more than 0.5 &#x3bc;m, and the coating solution has a color tone a* of not less than &#x2212;4.0 as measured according to JIS Z 8729 and a whiteness W of not less than 62 as measured according to JIS Z 8715.

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Fukuoka, Japan

Mai Kaneko