| 摘要 |
PROBLEM TO BE SOLVED: To provide a biaxially oriented polyethylene terephthalate film for polarizing plate release, which is excellent in contrast property and breakage resistance and has excellent optical axis accuracy and thermal dimensional stability.SOLUTION: A biaxially oriented polyethylene terephthalate film for polarizing plate release is a biaxially oriented polyethylene terephthalate film satisfying the following requirements (1) - (4): (1) a heat shrinkage percentage when heated at 150°C for 30 minutes is 2.0% or less in a longitudinal direction and a width direction; (2) difference between the heat shrinkage percentage in the longitudinal direction and that in the width direction when heated at 150°C for 30 minutes is 1.0% or less; (3) an MOR value measured by a microwave transmission type molecular orientation meter is 1.80 to 2.10; and (4) a variation amount of an orientation angle in the film width direction is 3.0°- 5.0° per 500 mm. |
