| abstract |
Provided is an ETFE film which is resistant to wrinkles when stretched and a method for producing the same. An ethylene-tetrafluoroethylene copolymer film, which has a peak area S20 near 2θ = 20 ° and a peak area S19 near 2θ = 19 ° in a diffraction intensity curve obtained by measurement by X-ray diffraction method, From the peak area S17 around 2θ = 17 °, the degree of crystallinity determined by the following equation (1) is 55 to 70%, and the ratio of the quasicrystal layer determined by the following equation (2) is 10 to 20% An ethylene-tetrafluoroethylene-based copolymer film characterized in that Crystallinity (%) = (S19 + S20) / (S17 + S19 + S20) × 100 (1) Proportion of quasicrystal layer (%) = S20 / (S17 + S19 + S20) × 100 (2) |