| 摘要 |
<p>A process comprising: a step in which a solution of a polyamic acid in an organic solvent is cast or applied on a substrate and then dried to produce a polyamic acid film which has been partly cured and/or partly dried; a step in which this polyamic acid film is immersed in or coated with a tertiary amine or a solution of a tertiary amine; and a step in which this film is then dried while imidizing the polyamic acid. This process may comprise: mixing an organic solvent solution of a polyamic acid with a chemically converting agent and a catalyst; casting the mixture on a substrate, heating the coating, stripping the resultant coating film to obtain a partly cured and/or partly dried polyamic acid film in which the residual volatile ingredients comprise at least 50 parts by weight of the catalyst, up to 30 parts by weight of the solvent, and up to 20 parts by weight of the chemically converting agent and/or an ingredient derived from the chemically converting agent, subsequently imidizing the remaining amic acid, and then drying the film.</p> |
