| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a color-memorizing photochromic stamp ink composition which develops color by irradiation with ultraviolet rays or sunbeams containing ultraviolet rays to change from a colorless state to a colored state, or from a colored state (1) to a colored state (2) with high sensitivity in a high density and keeps the state after the color change unless it is irradiated with visible light, and a convenient stamp tool using the same. <P>SOLUTION: The color-memorizing photochromic stamp ink composition is prepared by dissolving, dispersing or suspending a photochromic agent containing a diaryl ethene-based photochromic compound in a vehicle comprising at least a solvent and a binder. The stamp tool is obtained by impregnating either a plastic porous item having open cells or a porous item having countless capillary interstices made of a processed fiber, which constitutes a stamp material or a stamp pad, with the ink composition. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
