| 摘要 |
The present invention provides a biaxially oriented polyester film exhibiting the effect of making high-quality display possible when mounted in a display device such as a liquid crystal display. A biaxially oriented polyester film satisfying (1) and (2). (1) Formula (i) is satisfied, given that when measuring a polyester film using a Fourier transform infrared spectroscopy (FT-IR) transmission method, the spectral intensity observed at 973cm-1 is rtransmission1, and the spectral intensity observed at 793cm-1 is rtransmission2, and when measuring the polyester film using a Fourier transform infrared spectroscopy (FT-IR) ATR method, the spectral intensity observed at 973cm-1 is rATR1, and the spectral intensity observed at 793cm-1 is rATR2. (i) 1.00<R≤2.50 Herein, R=(rATR1/rATR2)/(rtransmission1/rtransmission2) (2) The angle of the principal orientation axis relative to the lengthwise direction of the film is 30-60°, inclusive. |
