| 摘要 |
The present invention relates to a compound having a trifluorovinyl ether group, a polyimide copolymer comprising the same, a preparation method thereof and optical films or a display substrate using the same, and a polyimide copolymer comprising a trifluorovinyl ether group whereby, according to the present invention, maintains optical properties and has significantly improved chemical resistance due to the properties of a cross-linked structure of an aromatic polyimide, thereby being useful in various kinds of optical films and display substrates. |
