| 摘要 |
PURPOSE:To enhance stability of developed color images, ground brightness and ground stability, by providing on a base a thermal color forming layer comprising a leuco dye and a color developer consisting of a phenolic sulfone compound of a specified general formula. CONSTITUTION:A leuco dye and a color developer of formula I (X is -O-, >C=O, >OC=O, O=CO<, Y is a lower alkyl, alkoxyl or halogen, n is an integer of 1-10, and m is an integer of 0-3) are dispersed to prepare a coating liquid. The coating liquid is applied to a base such as a paper, a synthetic paper and a plastic film, followed by drying to provide a thermal recording layer, thereby obtaining a thermal recording material. Examples of the phenolic sulfone compound of formula I, which is a color developer, include the compounds of formulas II and III, whereas the leuco dye may be a triphenylmethane leuco dye, a fluoran leuco dye or the like. |
