| 摘要 |
PURPOSE:To satisfactorily bond and join the whole faces of two substrates by using an adhesive which has both ultraviolet curability and primer contact curability. CONSTITUTION:An information recording layer 2 is formed on one side of each of two transparent substrates 1 and a protective layer 11 is formed on the information recording layer 2 to cover it. The faces of the protective layers 11 of the two transparent substrates 1 are faced and the whole faces are bonded and joined by an adhesive which has both the ultraviolet hardenability and the primer contact hardenability. Since the information recording layers 2 are opaque, ultraviolet rays cannot be projected on the layer of the adhesive 9 between the substrates 1 through them, however, in a transparent part where there are not the recording layers 2, the two substrates 1 can be bonded quickly by the ultraviolet hardenability of the adhesive 9. Thus, the whole faces of the two substrates can be bonded firmly. |
