| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject film which can exhibit both high elastic modulus and strong toughness (high elongation), by using a specific aromatic diamine component and a specified tetracarboxylic acid dianhydride component. SOLUTION: This polyimide film is obtained by reacting (A) (i) 4,4'- diaminophenyl ether and (ii) 4,4'-diaminobenzanilide as an aromatic diamine component with (B) (iii) 1,4-hydroxybenzoate-3,3',4,4'-tetracarboxylic acid dianhydride as a tetracarboxylic acid dianhydride component. The component i is preferably used in an amount of 50 to 85 mol.% based on the component A used for the reaction, and the component iii is preferably used in an amount of 15 to 45 mol.% based on the component B used for the reaction. The component B may, if necessary, further contain (iv) 3,3',4,4'-biphenyltetracarboxylic acid dianhydride. Thereby, the objective film which does extremely lower elastic modulus and can express strong toughness is obtained.
|
