OPTICAL DISK AND ULTRAVIOLET-CURABLE COMPOSITION FOR OPTICAL DISK

摘要

Disclosed is an optical disk wherein at least a light-reflecting layer and a light-transmitting layer are formed on a substrate, and recording or reproduction is performed by a laser light through the light-transmitting layer. The light-transmitting layer is composed of a cured product of an ultraviolet-curable composition containing an epoxy acrylate resin which is obtained by reacting a half-ester compound (A) obtained from a lactone adduct (a1) of a hydroxyalkyl (meth)acrylate and a dibasic acid anhydride (a2) with an epoxy resin (B). The light-transmitting layer has a film thickness of 50-150 µm.