| 摘要 |
PROBLEM TO BE SOLVED: To provide a reimageable image forming medium that keeps the image or the image contrast stable over a prolong time, without causing deterioration due to exposure to ambient ultraviolet light. SOLUTION: The image forming medium includes a substrate and an imaging layer coated on or impregnated into the substrate, wherein the imaging layer includes a photochromic polymer, dispersed optionally in a polymeric binder, the photochromic polymer including a polymer, having at least one photochromic unit grafted therein, wherein the imaging layer exhibits a reversible transition between a colorless state and a colored state in response to heat and light, and wherein the imaging layer does not exhibit a transition from the colored state to the colorless state, when heated in the absence of light. COPYRIGHT: (C)2009,JPO&INPIT
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