| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a polyester film for solar battery back sheets which has moist heat resistance and ultraviolet light resistance, and is capable of keeping these characteristics even after a label or tape adhering to a surface of the polyester film is peeled off.SOLUTION: A multilayered polyester film for solar battery back sheets comprises at least one outermost layer consisting of a layer (hereinafter referred to as "polyester A layer") including a primary component of polyester, and meets the requirements described in (1)-(3) below. In the multilayered polyester film, a layer other than the polyester A layer has a cleaving strength (90°) larger than that of the polyester A layer. (1)The polyester A layer has a cleaving strength (90°) of 4.3 N/15 mm or smaller. (2)The polyester A layer has a thickness of 5μm or larger. (3)In a tape peeling test on the polyester A layer, the thickness of the polyester A layer adhering to a tape is 4μm or smaller.</p> |
