| 摘要 |
PURPOSE:To obtain a recording material containing coloring matter having absorption in visible area and near infrared area, by adding at least one kind of 1,1,3,5,5-pentaphenyl-1,4-pentadien compounds as a coloring agent then bringing the coloring agent into contact with an electron receptive material and exhibiting color. CONSTITUTION:At least one kind of 1,1,3,5,5-pentaphenyl-1,4-pentadien compounds shown by formula (1) is added as a coloring agent. The compound is a colorless or faintly colored leuco pigment which exhibits color when being brought into contact with an electron receptive material such as phenol formalin type resin, salicylic acid metal salts, bisphenols, clay mineral such as attapulgite, silty clay and when being brought into contact with an oxidizing agent such as chloranil. In any case, a coloring image having absorption in visible area of 500nm-700nm and in near infrared area of 700nm-900nm in some case can be formed. |
