Patent ID: 8445099
Filing Date: 2013-05-21
Classification: B29C,B29K,C08G,C08J,C08L

Abstract:
1. A polyimide film obtained by biaxial drawing process in the machine direction (MD) and transverse direction (TD) of the film and the MD drawing is a 2-step drawing; the film characterized by the fact that the width of the fabricated film is ≧1 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 (θ) is within a range of 90°±23° with the machine direction (MD) as a reference in at least all of these 5 points.