| 摘要 |
PURPOSE:To obtain the titled copying material giving a copied image which disappears with the passage of time by forming a decoloring agent layer contg. a reducing agent or an oxidizing agent, an intermediate layer of an alkali soluble resin having a carboxyl group, and a photosensitive layer on a support. CONSTITUTION:A support is coated with a decoloring agent layer contg. an org. or inorg. reducing agent such as hydroquinone or an oxidizing agent such as p- nitrosodimethylaniline, an intermediate layer of an alkali soluble resin having >=1 carboxyl group such as casein, and a photosensitive layer contg. a diazo compound such as 4-diazo-1-dimethyl-aminobenzene, a coupling component such as resorcin and a Ca salt such as CaSO4 as principal components. The resulting copying material is exposed to ultraviolet light to form a latent image, and by development in an alkali atmosphere a copied image is obtd. The image part of the copied image is decomposed by reduction or oxidation with the reducing agent or the oxidizing agent which seeps slowly through the intermediate layer softened during the development, and the image disappears. |
