| 摘要 |
A polyimide film is provided to reduce generation rate of oligomer while maintaining excellent property by controlling a prepolymer to have a structure stable to moisture, and to improve adhesive force. A method for manufacturing a polyimide film polymerizes at least one kind of aromatic tetracarboxylic dianhydride and two different diamines with equal molar quantity and comprises a process of manufacturing a polyimide precursor comprises the steps of: reacting the constant molar amount of aromatic tetracarboxylic acid dianhydride and the first diamines in the presence of solvent, wherein the first diamines are much used than a molar ratio of the aromatic tetracarboxylic acid anhydride to prepare the first prepolymer; reacting the constant molar amount of the rest of aromatic tetracarboxylic acid dianhydride and the second diamines in the same batch, wherein the second diamines are much used than a molar ratio of the aromatic tetracarboxylic acid anhydride to prepare the second prepolymer; and copolymerizing the first prepolymer and the second prepolymer by injecting the rest of aromatic tetracarboxylic acid dianhydride in the same batch. |
