Optical information medium

摘要

An optical information medium having a light transmission layer obtained by curing a composition containing a urethane di(meth)acrylate (A) of the formula (I) and the other urethane di(meth)acrylate (B), and having a tensile elastic modulus of 600 to 1300 MPa at 25° C. and a light transmittance of 80% or more at wavelength of 400 nm (in the formula, R₁=an alicyclic diisocyanate residue, R₂=an alkylene group or an organic group containing a cycloalkyl group or ester bond, R₃=H or methyl group.):