Biaxially oriented polyester film and production method therefor

Abstract

The invention provides a biaxially oriented polyester film, which exhibits excellent transparency, is easily subjected to secondary processing, is an environmentally friendly polyester film, and has little variations in physical properties in the machine direction, and a production method therefor. The biaxially oriented polyester film is formed of a polyester resin composition containing particles and 50% by weight or more of a polyester resin composed of biomass-derived ethylene glycol and fossil fuel-derived dicarboxylic acid units, wherein at least one surface of the biaxially oriented polyester film meets requirements (1) to (3): (1) a number of fine protrusions each having a height of less than 3 nm per area of 4×10−12 m2 is 250-600; (2) a number of fine protrusions each having a height of 3 nm or more per area of 4×10−12 m2 is 300-600; and (3) an arithmetic mean height Sa is 0.010-0.025 μm.

Dependencies are inferred from the claim text.