| 摘要 |
PURPOSE:To allow adhering and joining of two sheets of transparent substrates and to improve preservable stability by incorporating a polymerizable monomer selected from a specific acrylic monomer or methacrylic monomer and a prepolymer, etc., contg. polybutadiene as its main chain and having an acrylic group or methacrylic group, etc., as an adhesive agent. CONSTITUTION:This recording medium is constituted of an information recording layer 2, a transparent substrate 1 and the adhesive agent 7. The adhesive agent 7 is prepd. by incorporating 100pts.wt. polymerizable monomer selected from the acrylic monomer or methacrylic monomer contg. >=50wt.% isoboronyl acrylate and/or isoboronyl methacrylate, 25-100pts.wt. prepolymer contg. the polybutadiene as its main chain and having the acrylic group or methacrylic group as its both ends or side chains, 0.1-20pts.wt. polymn. initiator, and 0.1-20 pts.wt. polymn. accelerator. Well adhering and joining of two sheets of the transparent substrates 1, 1 are possible in this way and the reliability and preservation stability are improved. |
