| 摘要 |
PURPOSE:To improve heat resistance and durability by applying a reactive hot melt adhesive agent containing compound of polyoxazolidine onto a recording layer or a protecting layer, overlapping the adhesive face of another recording object or protecting plate onto the coated surface and setting them. CONSTITUTION:The reactive hot melt adhesive agent containing the compound of polyoxazolidine is directly applied onto the optical information recording medium, and the adhesive surface of the other optical information recording body or protecting plate is overlapped to set the adhesive agent. The reactive hot melt adhesive agent has urethane prepolymer containing isocyanate group as a main component, and the adhesive agent setting the viscosity at 60-130 deg.C to 3000-700000cps is used as suitable one. The urethane prepolymer is produced by the condensation polymerization of polyisocyanate and polyol and is a solid at a normal temperature while containing more than two isocyanate groups in one molecule. Concretely, the quantity of containing the isocyanate group is 0.4-5 weight % and further, there is one having an isocyanate index member larger than 1 and smaller than 2. |
