| abstract |
A process of preparing a partially cured and / or partially dried polyamic acid film by casting a polyamic acid organic solvent solution on a support or by applying it to a support, and drying the polyamic acid film as a tertiary amine or tertiary amine The process of immersing or apply | coating to the solution of this, and the process of drying this film, imidating a polyamic acid are included. In addition, after mixing a chemical conversion agent and a catalyst in the organic solvent solution of polyamic acid, it casts and heats on a support body, and peels from a support body, and 50 weight part or more of residual volatiles is a catalyst, 30 weight part or less is a solvent, and A partially cured and / or partially dried polyamic acid film having 20 parts by weight or less of chemical conversion and / or chemical conversion derived components is then imidated with the remaining amic acid and further dried. |