| abstract |
A solar cell back surface protective sheet characterized by comprising a base material layer (P1 layer) composed of a polyester resin and an easy adhesion layer (P2 layer) adjacent to at least one side of the P1 layer, the P2 layer conforming to the following (1) and (2): (1) A component comprising a urethane resin component, a melamine resin component, and an epoxy resin component; and (2) a water contact angle of 74° or more.nIn the conventional method, the adhesive layer with the packaging material of the solar cell unit has a very weak adhesion to the packaging material, of course, in the processing of the solar battery cell, as a solar battery cell. During use outside the house, problems such as easy peeling between the interface with the packaging material or the layer that is easily adhered occur. Therefore, in the present invention, a solar cell back surface protective sheet is provided, which is excellent in adhesion to a packaging material, and maintains adhesion even when it is left outside for a long period of time (excellent adhesion) . |