Provided is an actinic energy ray curable composition which makes it possible to produce a back protective sheet for a solar cell excellent in adhesion between sheet members and moist-heat resistance with high yield and high productivity at low cost. The adhesive contains a urethane resin (D) and a epoxy resin (E). The urethane resin (D) is prepared by reacting a diol ingredient (A1) having no (meth)acryloyl group, an optional diol ingredient (A2) having no (meth)acryloyl group, no carbonate structure and no alicyclic structure, a polyol ingredient (B) having a (meth)acryloyl group and two or more hydroxyl groups in a molecule, and a polyisocyanate ingredient (C) together. The ingredient (A1) is selected from a diol (a1) having a carbonate structure and an alicyclic structure in a molecule, a combination of a diol (a2) having no alicyclic structure but having a carbonate structure, and a diol (a3) having no carbonate structure but having an alicyclic structure, and a combination of a diol (a1) and at least one of the diol (a2) and the diol (a3).
本发明提供了一种光能射线固化组合物,它能以低成本、高产量和高生产率生产出片材间粘合性和耐湿热性优异的太阳能电池背面保护片。该粘合剂包含聚
氨酯
树脂(D)和环氧
树脂(E)。聚
氨酯
树脂(D)是由不含(甲基)
丙烯酰基的二元醇成分(A1)、不含(甲基)
丙烯酰基、无
碳酸结构和脂环结构的任选二元醇成分(A2)、分子中含有一个(甲基)
丙烯酰基和两个或两个以上羟基的多元醇成分(B)以及多
异氰酸酯成分(C)反应制备而成。成分 (A1) 选自分子中具有
碳酸酯结构和脂环结构的二元醇 (a1),不具有脂环结构但具有
碳酸酯结构的二元醇 (a2) 和不具有
碳酸酯结构但具有脂环结构的二元醇 (a3) 的组合,以及二元醇 (a1) 和二元醇 (a2) 及二元醇 (a3) 中至少一种的组合。