| 摘要 |
PURPOSE:To improve corrosion resistance and to improve resistance to scuffing, etc., as well by providing a film consisting of a resin polymerizable by cation and curable by radiation as a protective film. CONSTITUTION:The film consisting of the resin polymerizable by cation and curable by radiation is provided as the protective film 3. Since the protective film 3 is formed of the film consisting of the resin polymerizable by cation and curable by radiation (UV rays in particular), the penetration of oxygen and moisture is thoroughly prevented as compared to the film of a radical polymn. type and the corrosion resistance is improved. In addition, the film is strong to scuffing and can be formed by applying a coating compd. The adhesiveness to a recording layer 2 is good and the workability in film formation is improved.
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