| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information medium having a light transmission layer having excellent transparency, wear resistance, mechanical characteristics and the like. <P>SOLUTION: The optical information medium has the light transmission layer formed by curing a composition containing a urethane di(meth)acrylate (A) represented by formula (I) (wherein, R<SB>1</SB>= an alicyclic diisocyanate residue, R<SB>2</SB>= an organic group containing an alkyl group, a cycloalkyl group or an ester bond, R<SB>3</SB>=H or a methyl group) and a urethane di(meth)acrylate (B) except the urethane di(meth)acrylate represented by formula (I) and having 600 to 1,300 MPa modulus of tensile elasticity of 25°C and ≥80% light transmittance of light having 400 nm wavelength. <P>COPYRIGHT: (C)2003,JPO |
