| abstract |
The limited playback optical data storage medium includes a first substrate, a reflective layer, a data layer disposed between the substrate and the reflective layer, a reactive layer including one or more carriers and one or more reactive materials, and a polylayer. An optically transparent second substrate containing a methacrylate copolymer or a blend of polymethacrylate homopolymer or copolymer is provided. The second substrate is disposed between the reaction layer and the laser incident surface and is adjusted to have an oxygen transmission rate in the range of about 0.1 to about 1.35 Barrer at 25 ° C. [Selection figure] None |