| 摘要 |
PROBLEM TO BE SOLVED: To improve the image storing property, and increase the sensitivity, and at the same time, improve the weather-resistance and heat-resistance of a white paper section and an image section by forming an ultraviolet ray absorbing agent contained in one surface of a supporting body, of a methylene bisbenzotriazole based compound represented by a specified structural formula. SOLUTION: A methylene bis benzotriazole based compound represented by formula I (in the formula, R represents a group represented by formula II (in the formula, R1 and R2 are the same or different, and each represent a hydrogen atom or an alkyl group of which the number of carbon atoms is 1-10, n is an integer of 4-8, and m is an integer of 0-20)) is excellent in compatibility with a leuco dye and a color developer, and in addition, has extremely high heat-resistance and transpiration-resistance, and both of a high heat- resistance and a high sensitivity are made possible. Also, a long term weather- resistance at a high degree can be imparted, and at the same time, the preservation rate of an image can be kept extremely high even leaving the image to stand at a place directly exposed to solar beams. |
