| 摘要 |
PURPOSE:To obtain a transfer sheet capable of effectively giving latent images composed of an ultraviolet rays absorber to an usual paper and also of permitting confirmation by a simple operation by using a paper coated with an usual paper transfer type recording layer containing ultraviolet rays absorber capsules and a wax. CONSTITUTION:A transfer sheet for preparation of secret documents is produced by forming a coated paper with an usual paper transfer type recording layer by using a coating liquid containing capsules with an ultraviolet rays absorber [2-(2'-hydroxy-5'-methylphenyl) benzotriazole, etc.] and a wax (paraffin wax, etc.). The ultraviolet rays absorber used is preferably dissolved in a nonvolatile oil as a vehicle, and its preferred amount to be dissolved in the vehicle is 0.5- 5wt%. The preferred amount of the wax is 5-100% on the basis of the solid content of the capsule. EFFECT:Latent image can be obtained simply by pressing the transfer sheet on usual papers and can also be confirmed by a fluorescent inspection lamp. |
