| 摘要 |
PURPOSE:To contrive to separate easily a self supporting film from a base body by a method in which at the manufacture of aromatic polyimide film by casting process, the aromatic polyamix acid solution containing a specified amount of carboxylic acid, is cast on a base body and is made into a film by drying. CONSTITUTION:Aromatic polyamix acid solution contains 0.01-70pts.wt. carboxylic acid shown by a general formula RCOOH to 100pts.wt. aromatic polyamix acid. Said solution has 4-35wt% polymer concentration and logarithmic viscosity with the molecular weight equal to or larger than 0.2. Said solution is filtered and deareated, and then is cast with uniform thickness on a metallic drum from a hopper and a T-die. Then it is heated by hot blast or infrared ray, etc. and the solvent therein is gradually removed. The solution is preliminarily dried until it has self supporting property. Next, the film with self supporting property is separated from the metallic drum. |
