| abstract |
A biaxially stretched polyester film having excellent transparency and slipperiness, containing 0.005 to 1% by weight of an organic lubricant and having the following properties after biaxial stretching and heat-setting: DELTA H</=0.3% (1> H<100>0</=0.9% (2> mu s</=1.2 (3> wherein DELTA H is the surface haze of the biaxially stretched film, H<100>0 is the internal haze of the film as calculated based on the 100 mu m film thickness, and mu s is the coefficient of static friction of the film. It is used as a based film for recording materials such as microfilms, printing plates, X-ray photographs, and for transparent electrode substrates. |