| 摘要 |
PURPOSE:To improve lowering of contrast between a printing area and a surface area after irradiation of indoor light by a method wherein basic dye and aromatic secondary amine aging prevention agent are included in a thermal recording layer and at least one kind of agent selected from hindered phenol antioxidants represented by a specific formula also is included therein. CONSTITUTION:Basic dye wherein a printing image has absorption in a near- infrared region, an aromatic secondary amine aging prevention agent, and at least one kind of agent selected from hindered phenol antioxidants represented by a formula I (R1: substitutable saturated or unsaturated alkylene group; substitutable cycloalkylene group, R1 and R2 may be identical or different, each hydrogen atom; halogen atom; substitutable saturated or unsaturated alkyl group; alkoxyl group) and a formula II (R4, R5, R6 are hydrogen atoms; halogen atoms; substitutable saturated or unsaturated alkyl group; alkoxyl group) are included in a thermal recording layer. |
