| 摘要 |
PURPOSE: To provide an optical disk excellent in fitting precision, bonding strength and bonding strength after a durability test by bonding a hub to a transparent substrate with a photosetting resin which is set even with visible light. CONSTITUTION: A mixture is prepd. by mixing 20-80wt.% urethane (meth)acrylate having <3 (meth)acryloyl groups in one molecule with 5-50wt.% one or more kinds of (meth)acrylic monomers represented by formula 3 or 4 and 0-50wt.% monomer other than the (meth)acrylic monomers. The urethane (meth)acrylate is obtd. by allowing a polyol compd. to react with an org. polyisocyanate compd. and allowing the resultant urethane oligomer having terminal isocyanato or hydroxyl groups to react with a hydroxyl compd. represented by formula 1 or an isocyanate compd. represented by formula 2. A photopolymn. initiator having absorption in an UV region and a photopolymn. initiator having absorption in a visible resin are added by 0-99.9wt.% and 0.1-100wt.%, respectively, to 100 pts.wt. of the prepd. mixture to obtain an adhesive compsn. |
