| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk hardly deformed during recording by a laser, and reproducing recorded information satisfactorily by a blue laser. <P>SOLUTION: The optical disk has at least a light reflection layer, an information recording layer and a light transmission layer consisting of the cured material of an ultraviolet (UV)-curable composition, and performs recording or reproducing by the blue laser incident from the light transmission layer side, in which the UV-curable composition contains (1) a compound A having a polycyclic structure within the same molecules and two or more radical polymerizable unsaturated double bonds, (2) an isocyanurate compound B having the radical polymerizable unsaturated double bonds within the same molecule, and (3) a compound C having a cyclic structure and the one radical polymerizable unsaturated double bonds within the same molecule; and the total content of the compound A and the compound B is ≥40mass% of the radical polymerizable compound in the UV-curable composition. <P>COPYRIGHT: (C)2008,JPO&INPIT |
