| 摘要 |
PROBLEM TO BE SOLVED: To provide a release film wherein the color tone of the film varies by being irradiated with ultraviolet rays, the film region subjected to ultraviolet irradiation treatment can be easily visually discriminated, and which is producible without adding a new process to the producing processes of the release film or varying the processes, and has excellent transparency. SOLUTION: The release film has a release layer at least on one side of a polyester film containing an organic photochromic compound. COPYRIGHT: (C)2010,JPO&INPIT
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