| abstract |
A method for producing a polyimide resin capable of obtaining desired characteristics and a polyimide resin are provided. A block operation is performed in which different polymers (terminal active polymer A, terminal active polymer B) are formed while the terminal active groups remain, and both polymers are polymerized. Thereby, since different polymer chains are chemically bonded, separation of the solution (liquid separation) can be prevented. Further, since each of the different polymers has a high molecular weight, when formed into a film, an appropriate phase separation structure develops, the characteristics of both are not averaged, and excellent characteristics are exhibited. [Selection] Figure 3 |