| 摘要 |
PROBLEM TO BE SOLVED: To provide an adhesive sheet having high stress relaxation properties and adhesiveness.SOLUTION: There is provided a double-sided adhesive sheet for bonding a first transparent substrate and a second transparent substrate. The double-sided adhesive sheet has a first adhesive layer and a second adhesive layer, the first adhesive layer is mainly composed of any one of an acrylic adhesive, a polyester-based adhesive and an epoxy-based adhesive, the second adhesive layer is mainly composed of an urethane-based adhesive, the gel fraction of the first adhesive layer is larger than the gel fraction of the second adhesive layer, the interlayer strength between the first adhesive layer and the second adhesive layer is 5 N/25 mm or more, the first adhesive layer is in contact with the first transparent substrate, the second adhesive layer is in contact with the second transparent substrate, and the first transparent substrate is any one of a polycarbonate monolayer sheet, a polymethyl methacrylate monolayer sheet, a polycarbonate-polymethyl methacrylate laminar sheet, a triacetyl cellulose sheet and a cycloolefin polymer sheet. |
