| 摘要 |
The present invention is directed to a polyimide film with a uniform orientation angle in the transverse direction of the film. A polyimide film characterized by the fact that the width of the fabricated film is ≧1.5 m, 2 points positioned inside by 200 mm from both ends of the width of the fabricated film are selected on a linear line in the vertical direction to the machine direction (MD) of the film, 1 point within center part ±200 mm, and 2 optional points are further selected on a linear line that includes said 2 points within the range of the linear line that connects said 2 points, and the orientation angle (&thetas;) is within a range of 90°±23° in at least all of these 8 points. |
