Optical transparent adhesive sheet, method for producing optical transparent adhesive sheet, laminated body, and display device with touch panel

An optically clear adhesive sheet comprising

• a cured product of a thermosetting polyurethane composition, wherein the thermosetting polyurethane composition contains a polyol component, a polyisocyanate component, a tackifier, and a catalyst,
• the polyol component consists of polyols having an olefin skeleton, wherein the polyols having the olefin skeleton are the only polyol component in the thermosetting polyurethane composition,
• the polyisocyanate component is a modified polyisocyanate that is obtained by reacting an acyclic aliphatic and/or alicyclic polyisocyanate containing an isocyanate group with an ether compound containing an ethylene oxide unit,
• the thermosetting polyurethane composition has an α ratio, which is the number of moles of OH groups derived from the polyol component/the number of moles of NCO groups derived from the polyisocyanate component, of 1.6 to 1.96,
• an amount of the catalyst is greater than or equal to 0.001 wt % and less than or equal to 0.1 wt % with respect to a total amount of the polyol component and the polyisocyanate component,
• the tackifier is a hydrogenated petroleum resin obtained by hydrogenating a copolymer of dicyclopentadiene and an aromatic compound,
• an amount of the tackifier is 1 wt % to 20 wt % with respect to a total amount of the thermosetting polyurethane composition,
• the polyols having the olefin skeleton is a polyolefin polyol obtained by hydrogenating a hydroxy group-terminated polyisoprene, both-end hydroxy group-terminated hydrogenated polybutadiene, or polyhydroxy polyolefin oligomer,
• a number average molecular weight of the polyol component is 500-3000,
• the optically clear adhesive sheet having
• a shear storage modulus (G′) at 85° C. of 4.5×103 to 5.0×104 Pa,
• a loss tangent (tan δ) at 85° C. of 0.3 to 0.97, and
• a thickness of 50 to 2000 μm.