| 摘要 |
Disclosed herein is a biaxially oriented polyethylene naphthalate film which shows the haze-increasing rate, represented by the formula: Haze-increasing rate (%)=[(H2-H1)/H1x100 wherein H1 is the haze before subjecting the film to heat treatment and H2 is the haze after subjecting the film to heat treatment, of not more than 20% and both the heat shrinkage in the longitudinal direction and the heat shrinkage in the transversal direction of not more than 0.5% when subjecting the film to heat treatment for 2 hours at 150 DEG C.
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