| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method for a copolymerized polyamide capable of preventing the distillation of and the control of a mol balance of dicarboxylic acids and diamines. SOLUTION: The copolymerized polyamide is produced by batchwise polycondensing diamines containing, at least, diamines having a high boiling point and diamines having a low boiling point, and dicarboxylic acids. The production method is composed of (1) a process for melting dicarboxylic acids, (2) the process for adding diamines having the low boiling point, while keeping the temperature above any higher melting point of the melting point of dicarboxylic acids and the melting point of a mixture in a reaction system, and also below the boiling point of diamine having the low boiling point, and then (3) the process for adding all diamines having the high boiling point, while keeping the temperature above the melting point of mixtures in reaction system and below the boiling point of diamines having the high boiling point.
|
