| 摘要 |
A bonded optical disk comprising first (12) and second (14) transparent substrates bonded with a light-permeable, pressure sensitive adhesive layer (20) and at least one information recording layer (16, 18) wherein the pressure sensitive adhesive layer has been formed from a pressure sensitive adhesive precursor, having a viscosity of 10 to 5000 cps and being applied onto at least one of the first substrate and the second substrate, by radiation curing and has a gel fraction of not less than 50 % and a storage modulus of 1.0 x 10<4> to 1.0 x 10<7> dyn/cm<2> at 25 DEG C, or in place of the pressure sensitive adhesive layer, an adhesive layer derived from a radiation curable adhesive precursor having a viscosity of 500 to 10000 cps, and the adhesive precursor is subjected to a higher pressure than an atmospheric pressure, prior to being irradiated, as well as a method and an apparatus for producing a bonded optical disk. |
