| 摘要 |
<p>A biaxially oriented polyester film simultaneously satisfying the following formulas (I) to (III): ¦S180 - S120¦ </= 54 (I) Ts<MD> >/= 100 (II) Q120 </= 0.7 (III) wherein S180 is shrinking stress (g/mm<2>) of the film in the machine direction at 180 DEG C, S120 is shrinking stress (g/mm<2>) of the film in the machine direction at 120 DEG C, Ts<MD> is shrinkage initiation temperature ( DEG C) of the film in the machine direction, and Q120 is shrinkage (%) of the film in the machine direction after 5 hours' treatment at 120 DEG C, is described. The film has a good dimensional stability due to its low shrinkage, particularly in the machine direction, and substantially free from defect such as wave and wrinkle.</p> |
