| 摘要 |
A transparent polyimide resin is provided to ensure excellent thermal stability and mechanical property by using a copolymer of 3,3'-diaminophenylsulfone, 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride and 3,3',4,4'-diphenylsulfonetetracarboxylic dianhydride. A transparent polyimide resin comprises the repeating units of the following formula 1a and 1b and the specific viscosity of 0.4 ~ 0.6 dl/g. The polyimide resin is obtained by copolymerizing a di-anhydride component indicated as the following chemical formula 2 and a diamine component indicated as the following chemical formula 3.
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