| 摘要 |
A thermal recording material includes a thermosensitive coloring layer, which is made by applying a dispersion liquid, in which the developer and a coloring dye are dispersed, onto a supporting base, and then drying the base. The developer contains 4,4'-dihydroxydiphenyl sulfone as a major component; and 2,4'dihydroxydiphenyl sulfone, the 4,4'-dihydroxydiphenyl sulfone and the 2,4'-dihydroxydiphenyl sulfone being contained at a weight ratio greater than 90:10 and no more than 100:0, and the developer containing phenolsulfonic acid phenyl ester no more than 1.5% by weight with respect to a sum quantity of the 4,4'-dihydroxydiphenyl sulfone and the 2,4'-dihydroxydiphenyl sulfone. The present invention thus provides a thermal recording material causing less surface texture fogging and is superior in preservation ability, and also provides a developer suitably used as a component of the thermal recording material.
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