| 摘要 |
The present invention relates to polyamic acid comprising a polymerization reactant of diamine and dianhydride. The diamine includes 9,9-bis(3-fluoro-4-aminophenyl)fluororene (FFDA). The dianhydride includes 2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 3,3,4,4-biphenyltetracarboxylic dianhydride (BPDA). Further, the present invention relates to a polyamide resin which is an imide of polyamic acid, and to a polyamide film. The polyimide film of the present invention has improved yellow index and optical isotropy while maintaining excellent characteristics which a conventional polyimide film has. |
