| 摘要 |
PURPOSE:To obtain a thermal recording material having favorable developed color density, color forming sensitivity and ground brightness and having high practicality, by using a dithioether compound of a specified general formula, in a thermal recording material utilizing a color forming reaction between a leuco dye and a color developer. CONSTITUTION:A dithioether compound to be used as a auxiliary component is represented by the generated formula, wherein R is a hydrocarbon group having at least one unsaturated double bond,each of X and Y is hydrogen, a lower alkyl, alkoxyl, aryl, acyloxyl, aralkyl or halogen, and each of m and n is an integer of 0-3. The compound is highly capable of dissolving a color developer (electron-acceptive compound) and a leuco dye (electron-donative colorless dye) when being heated, and by regulating the melting point thereof, it is possible to obtain a thermal recording material with an arbitrary sensitivity. The melting point is preferably 40-150 deg.C, from the viewpoints of preservation stability and sensitivity of the thermal recording material. |
