Abstract: Disclosed is an adhesive for laminated sheets comprising: a urethane resin obtainable by mixing an acrylic polyol with an isocyanate compound; and a silane compound; wherein the silane compound contains a glycidyl based silane compound, wherein the acrylic polyol is obtainable by polymerizing polymerizable monomer, the polymerizable monomer contains a monomer having a hydroxyl group and the other monomer, and the other monomer contains acrylonitrile, and the isocyanate compound contains at least one selected from xylylene diisocyanate and hexamethylene diisocyanate. The adhesive for laminated sheets has a moderate curing rate and is excellent in initial adhesion to a film and in long-term hydrolysis resistance at high temperature; it is also excellent in weatherability.

Abstract: An outdoor urethane adhesive including a urethane resin obtained by reaction of an isocyanate compound with a polyol having an ester bond. The isocyanate compound contains at least one of an aliphatic isocyanate or an alicyclic isocyanate. The polyol contains both a polyester polyol and an acrylic polyol. The urethane adhesive is excellent in initial adhesion, cured adhesion and flexibility of the cured adhesive film. When the urethane adhesive further includes a hydroxyphenyltriazine-based compound the adhesive has little change in color difference and has improved weatherability. The outdoor adhesive can be used to form a solar battery backsheet. The solar battery backsheet can be used as part of a solar battery module.