| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a polyimide polymer by which the rise in the viscosity of the polymer liquid is controlled to prevent the polymer liquid from winding around a stirrer on the production of the polyimidosiloxane and which does not need a special operation for lowering the viscosity during the process. SOLUTION: This method for producing the polyimide copolymer, characterized by carrying out the copolymerization of (a) a tetracarboxylic acid component capable of giving the heat-resistant polyimide with a diamine component comprising (b) a diaminopolysiloxane, (c) an aromatic diamine having a polar group, and, if necessary, (d) an aromatic diamine having plural benzene rings in an organic solvent under the flow of humidified nitrogen in a reaction vessel equipped with a stirrer.
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