| 摘要 |
PURPOSE:To obviate the exfoliation of the adhered part of disk-shaped substrates owing to aging and deformation by using an epoxy adhesive agent curable by UV rays as an adhesive agent. CONSTITUTION:This optical information recording medium is constituted by joining two sheets of the disk-shaped substrates by the adhesive agent directly or via an annular spacer and providing a recording layer which permits writing and/or reading of information by a laser beam to the inside surface of at least one substrate thereof. The adhesive agent used for such information recording medium is an adhesive agent curable by UV rays contg. at least a photopolymn. initiator which forms a cation polymn. initiator when irradiated with UV rays and epoxy compd. having >=2 epoxy groups in the molecule. The photopolymn. initiator described in, for example, 'UV.EB Curing Technology' is used as the photopolymn. initiator which forms the cation polymn. initiator when irradiated with the UV rays. The epoxy compd. described in, for example, 'Epoxy Resins' (published by Nikkan Industrial Newspapers Co., Ltd. and compiled by Hiroyuki Hashimoto) is used for the epoxy compd. having >=2 epoxy groups in the molecule. |
