| 摘要 |
[Problem] The present invention provides a polyester composition which has excellent hydrolysis resistance, heat resistance and cost and is thus suitably used as a solar battery film. [Means for Solution] Provided is a polyester composition for a solar battery, which comprises a dicarboxylic acid component having terephthalic acid as a main component and a diol component having ethylene glycol as a main component, the polyester composition being characterized by satisfying the following Formulae (1) to (5): 0.65 ‰¤ intrinsic viscosity < 0.90 (1); 0.7 ‰¤ M/P ‰¤ 1.3 (2); 200 ppm ‰¤ P ‰¤ 600 ppm (3); Amount of terminal carboxyl groups < 15 eq/t (4); and Amount of terminal methoxy groups ‰¤ 10 eq/t (5) (in the Formula (2), M represents the number of moles of an alkaline metal element and/or an alkaline earth metal element per 10 6 g of a polyester; and P represents the number of elemental phosphorus per 10 6 g of a polyester). |
