(57) A thermal recording material having a thermal recording layer that utilizes a color
forming reaction between at least one basic dye and a color developing agent capable
of forming color in contact with said basic dye, said thermal recording layer containing
a dihydroxydiphenyl ether of the formula:
so as to enhance the color forming ability and degree of brightness of said thermal
recording material. In order to enhance the image stability of this thermal recording
material, the thermal recording layer may further contain at least one compound selected
from the group consisting of 1,1,3-tris(2-methyl-4-hydroxy-5-t-butylphenyl)-butane,
1,1,3-tris(2-methyl-4-hydroxy-5-cyclohexyl)butane, 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanuric
acid and 1,1-bis(2-methyl-4-hydroxy-5-t-butylphenyl)butane.
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