ERASABLE OPTICAL DISK HAVING AN IMPROVED OPTICALLY TRANSPARENT SUBSTRATE

摘要

An erasable optical disk having a grooved (6) substrate (1) which is made of a cured polymer product formed by radical polymerization of a composition comprising a specific type of (meth)acrylate compound alone or in combination with at least one compound selected from N-substituted maleimide compounds and epoxy-novolac (meth)acrylate compounds. The substrate (1) has a good heat resistance, a good transparency, and can be produced at a high productivity.