| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyimide copolymer which can produce a molded product of high elastic modulus, low thermal expansion and low water absorption and is useful as a TAB base film by molecularly binding a specific block polyimide component to a randomly copolymerized polyimide component. SOLUTION: (A) A polyimide block component from an aromatic diamine of a rigid structure of formula I (X is H, a halogen, carboxyl, a lower alkyl, a lower alkoxy) such as p-phenylenediamine (A1 ) and an aromatic tetracarboxylic acid, for example, pyromellitic acid, 3,3',4,4'- biphenyltetracarboxylic acid or 3, 3',4,4'-benzophenone-tetracarboxylic acid (A2 ) and (B) a polyimide random copolymer component from an aromatic diamine of a flexible structure of formula II (Y is X; A is O, S, CO, SO, SO2 , CH2 ), for example, 4,4'-diaminodiphenyl ether (B1 ) and 2 or more kinds of A2 are molecularly bonded to each other. |
