OPTICALLY READABLE INFORMATION DISK

摘要

An optically readable information disc comprises a substrate plate having on at least 1 side a radiation-cured lacquer layer (I) provided with an information track having information regions alternately at high and low levels along the track and covered with a reflective layer. (I) has a min. indentation hardness corresponding to a penetration of 5 microns of a needle having a ball-shaped tip of hard material and a dia. of 17-19 microns pressing with a wt. of 2.4- 2.6g. The indentation hardness corresponds to a depth of penetration of 1.5-3 microns. (I) comprises at least 50 wt.% of a di-and/or triacrylate having a mol. wt. of 200-350 and a monofunctional cpd. esp. N-vinylpyrrolidone.