Biaxial oriented polyester film and method of manufacturing same, photographic substrate, and photographic light-sensitive material

摘要

An object of the present invention is to provide a biaxial oriented polyester film and a method of manufacturing the same, in which sufficient suitability for the longitudinal stretching and transparency can be achieved in a film while a high slidability is ensured. Further, the present invention provides a photographic substrate and a photographic light-sensitive material utilizing the biaxial oriented polyester film having the above-described excellent characteristics. Specifically, a biaxial oriented polyester film and a method of manufacturing the same, a photographic substrate, and a photographic light-sensitive material are provided, and the biaxial oriented polyester film comprises 0.001 to 0.05% by weight of spherical silica particles with a number average particle diameter (Xm) of 0.20 to 0.50 mum and a particle size distribution represented by the following formula (1):wherein d10 represents a particle diameter (mum) obtained when the number of the particles is summed from the particles with the smallest diameter toward the particles with larger diameters and the number reaches 10% of the total number of the particles, and d90 represents a particle diameter obtained in the same manner as for d10 described above except that the particle diameter is obtained when the number of the particles reaches 90% of the total number of the particles.