| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an adhesive for optical use, and others, excellent in practicality, which hardly causes peeling when used for laminating a touch panel with an electrostatic capacitance system constituting a mobile phone, a tablet PC or the like.SOLUTION: The adhesive for optical use comprises at least an acrylic adhesive, and a terpene-based tackifier resin or a rosin-based tackifier resin, in which the acrylic adhesive is a polymer of a monomer component containing an alkyl methacrylate having an alkyl group with 10 or more and 18 or less carbon atoms by 10 mass% or more and 39 mass% or less, and the terpene-based tackifier resin or the rosin-based tackifier resin is included by 5 parts by mass or more and 30 parts by mass or less in terms of a solid ratio with respect to 100 parts by mass of the acrylic adhesive. The adhesive for optical use, when formed into an adhesive layer for an optical use, shows a dielectric constant of less than 3.0 at 100 kHz frequency and has an adhesive strength to glass of 20 N/25 mm or more and 50 N/25 mm or less at 25°C.</p> |
