| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a curable resin composition for an optical disk (e.g. a blue ray (R) disk) which includes a reflection film reflecting a laser beam for information reading on a substrate and a protective layer (a transparent cover layer) having 10 to 150 μm thickness on the reflection film, the curable resin composition being highly transparent, achieving recording/reproduction with high reliability, and having excellent long-term storage stability (having excellent low-warpage properties in a heat promoting test, having low film-remaining properties, and rarely causing permanent deformation such as dents). <P>SOLUTION: The curable resin composition contains (a) an oligomer and/or a polymer having at least one or more radically polymerizable groups and/or ionically polymerizable groups, (b) a polymerizable monomer and (c) a photopolymerization initiator and has (d) 500 to 3,500 mPa S viscosity at 25°C. A cured product obtained by curing the curable resin composition has (A) ≥85% ray transmittance at 405 nm wavelength in 100 μm film thickness, (B) 0.1 to 2.0% mass reduction amount when being held for 100 hr at 70°C, (C) 10 to 150 MPa storage modulus at 25°C, (D) 0.10 to 0.70 loss tangent tanδ at 25°C, and (E) 0 to 30°C glass transition temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT |
