| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminate polyester film for a solar battery back face protective material, which excels in hydrolysis resistance and in adhesiveness with the sealing resin of a solar battery cell.SOLUTION: Provided is a laminate polyester film for a solar battery back face protective material having a polyester A layer in at least one outermost layer and including at least one instance of polyester B layer, wherein the laminate polyester film has 26 eq./ton of terminal carboxyl groups, and includes, on at least one surface of the polyester A layer, a coating layer which is formed from polyurethane having at least one kind of a polycarbonate skeleton and polyether skeleton and a crosslinking agent. Polyester A layer: containing aromatic polyester as the main constituent, and consisting of polyester whose white pigment content is less than 8 wt.%. Polyester B layer: containing aromatic polyester as the main constituent, and consisting of polyester whose white pigment content is 8 wt.% or more. |
