| 摘要 |
PROBLEM TO BE SOLVED: To provide a seismic isolation lamination layer body which is capable of maintaining excellent seismic isolation performance regardless of repeated shearing deformation caused by frequent earthquake. SOLUTION: The seismic isolation lamination layer body 1, which is the laminating body formed by alternately laminating and integrating a hard sheet 11 having rigidity and a soft sheet 12 having viscoelastic property, wherein the soft sheet 12 comprises alkyl (meta) acrylate with an alkyl group having carbon number of 2 to 20 and acrylic polymer obtained by crosslinking a photopolymerizability composition having a photopolymerization initiator in which the polymer has modulus of elasticity in shear of 4×104 to 5×106 Pa at 20 deg.C and also has a gel swelling ratio of 5 to 20, has a small degree of degradation in absorption power for earthquake energy even when the soft sheets receive shearing deformation repeatedly, thereby can demonstrate the stable and excellent seismic isolation performance without degradation thereof for a long period of time. |
