| abstract |
The present invention is characterized in that the content of the carboxyl group is 15 equivalent / t or less and the temperature (Tmeta) (° C.) of the small endothermic peak obtained by the differential scanning calorimetry is 220 ° C. or less and the temperature is 125 ° C. and the relative humidity is 100% 72 hour average elongation retention is 10% or more polyester substrate after allowed to stand, and is formed on a polyester base, to the mass ratio in the molecule is 15 to 85% by mass of the general formula (1) [R 1, R 2: H, A halogen atom, a monovalent organic group (R 1 and R 2 may be the same or different, plural R 1 and R 2 may be the same or different), and n: an integer of 1 or more] A polymer sheet for a solar cell excellent in adhesion durability under a moist heat environment and having a polymer layer containing a composite polymer containing a non-siloxane-based structural unit in an amount of 85 to 15 mass% is provided. |