| 摘要 |
PROBLEM TO BE SOLVED: To provide a biaxially oriented polyester film for optical applications which can carry out precise inspection in a cross-nicol method, for example, when used as a release film for producing a polarizing plate and has excellent productivity characteristics.SOLUTION: There is provided a polyester film for releasing a polarizing plate which contains inactive particles A and inactive particles B in both outermost layers of a laminated film comprising three or more polyester layers and contains 0.1 to 1.0 wt.% of inactive particles A and 0.005 to 0.05 wt.% of inactive particles B in both outermost layers, wherein the average particle diameter of inactive particles B is larger than the average particle diameter of inactive particles A and the orientation angle of the film is 15 degrees or more. |
