| 摘要 |
PROBLEM TO BE SOLVED: To enhance image preservability by adding a UV absorber in an undercoat layer and/or a thermal recording layer, a UV ray intercepting agent in the thermal recording layer and/or a protection layer, and fluorescent dye in the protection layer, and further adding a urea compound expressed by the specific structural formula into the thermal recording layer. SOLUTION: A UV absorber is contained in an undercoat layer and/or a thermal recording layer, a UV ray intercepting agent is contained in the thermal recording layer and/or a protection layer, and a fluorescent paint is contained in the protection layer, and further at least one kind of urea compounds expressed by the specific formula is contained in the thermal recording layer. In the formula, R1 , R2 may be the same or different, and show a hydrogen atom, a 1-4C alkyl group, and a halogen group, and R1 , R2 may be combined to form an aromatic ring. X, Y show an oxygen atom or a sulfur atom, and further Z shows a bivalent organic residue. A compound expressed in the formula has an excellent color-developing function and extremely superior image- preservability by the use of an organic color-developing agent. |
