Abstract: A solar cell rear surface protection sheet having two or more substrates laminated together by means of an adhesive, the adhesive includes a urethane resin obtained by mixing an acrylic polyol, an isocyanate compound, 3-glycidoxypropyltriethoxysilane, and tin octylate. The acrylic polyol is obtained by polymerizing polymerizable monomers, which include a hydroxyl group-containing monomer and other monomers. The other monomers include acrylonitrile. The isocyanate compound includes both a xylylene diisocyanate monomer and hexamethylene diisocyanate isocyanurate, and the xylylene diisocyanate monomer is present in an amount of 20 to 40 wt %, and the hexamethylene diisocyanate isocyanurate is present in an amount of 80 to 60 wt %. The equivalent ratio of isocyanate groups of the xylylene diisocyanate monomer and the hexamethylene diisocyanate isocyanurate to hydroxyl groups of the acrylic polyol is 1.0 to 3.0.

Abstract: This invention provides a solar cell rear surface protection sheet comprising two or more substrates laminated together by means of an adhesive, the adhesive comprising a urethane resin obtained by mixing an acrylic polyol, an isocyanate compound, 3-glycidoxypropyltriethoxysilane, and tin octylate, wherein the acrylic polyol being obtained by polymerizing polymerizable monomers, the polymerizable monomers comprising a hydroxyl group-containing monomer and other monomers, the other monomers comprising acrylonitrile, the isocyanate compound comprising both a xylylene diisocyanate monomer and hexamethylene diisocyanate isocyanurate, the xylylene diisocyanate monomer being is present in an amount of 20 to 40 wt %, and the hexamethylene diisocyanate isocyanurate is present in an amount of 80 to 60 wt % and the equivalent ratio of isocyanate groups of the xylylene diisocyanate monomer and the hexamethylene diisocyanate isocyanurate to hydroxyl groups of the acrylic polyol being 1.0 to 3.0.