Coated optical disks

An optical disk, comprising a substrate, a metallized layer and a coating, the coating being formed from a radiation-curable composition comprising from about 30 to about 70 weight percent of a first component selected from the group consisting of alkanediol diacrylates, alkanediol dimethacrylates, alkene glycol diacrylates, alkene glycol dimethacrylates, and mixtures thereof, from about 5 to about 40 weight percent of an acrylate- or methacrylate-containing alkoxylated bisphenol A compound as a second component, from about 10 to about 50 weight percent of an additional reactive acrylate component comprising ethoxylated triacrylate, pentaerythritol polyacrylate, isocyanurate mono, di- or triacrylate, or a mixture thereof, from about 2 to about 15 weight percent of a photoinitiator, and from about 0.01 to about 1 weight percent of an adhesion promoter comprising acrylated sulfonic acid, methacrylated sulfonic acid, acrylated sulfonic acid anhydride, methacrylated sulfonic acid anhydride, acrylated carboxylic, methacrylated carboxylic acid, acrylated carboxylic acid anhydride, methacrylated carboxylic acid anhydride, acrylated phosphoric acid, methacrylated phosphoric acid, or mixtures thereof.