| 摘要 |
PURPOSE:To obtain both improved vapor deposition and winding properties for a polyetherimide film by a method in which one side of the film is made into a specifically smooth face and the other side of the film is roughened to a specific surface roughness. CONSTITUTION:One side 11 of a film 1 is highly smoothened to enable better vapor deposition to be performed, or to an average roughness of 500Angstrom (0.05mum) or less for the center line, defined by JIS-B-0601. The other side 12 of the film 1 is roughened to an average roughness of 1,000Angstrom -15,000Angstrom for the center line to improve running and winding properties of the film. In producing the film 1, polyetherimide is dissolved in a solvent and the solution is cast or caoted on a supporter with a roughened surface, the solvent is removed out, and the polyetherimide film so formed is separated from the supporter. |
