| abstract |
A biaxially oriented polyester film having the following physical property is provided: when cooled from the molten state at a cooling rate of 20°C/min, an observed recrystallization temperature is 175°C-200°C. The biaxially oriented polyester film is formed by a thick sheet before bidirectional stretching that is melted and extruded by an extruder and then cooled and formed on a casting roll. The thick sheet before stretching having the following physical property as analyzed by differential scanning calorimetry: a crystallization rate is less than 10%. |