| 摘要 |
PURPOSE:To obtain a thermal recording material having excellent heat response characteristics and high sensitivity, by incorporating a specified compound as a sensitizer. CONSTITUTION:A compound of formula I, wherein R<1> is phenyl or phenoxy, and R<2> is phenyl or benzyl, is incorporated as a sensitizer in a thermal recording material comprising a colorless or light-colored dye precursor and a color developer capable of developing the color of the dye precursor by reacting therewith when being heated, to obtain a thermal recording material having excellent heat response characteristics and high sensitivity. The sensitizer is added in an amount of not less than 5wt% based on the amount of the color developer, preferably, 10-400wt%. The dye precursor is a compound based on triphenylmethane, fluoran, diphenylmethane, thiazine, spiropyran or the like, and the color developer is an acidic substance generally used for a thermal recording paper. Although a paper is mainly used as a base, the base may consists of a nonwoven fabric, a plastic film, a synthetic paper, a metallic foil or the like, or a composite sheet thereof. |
