Process for the synthesis of polyamides
    6.
    发明授权
    Process for the synthesis of polyamides 失效
    聚酰胺合成方法

    公开(公告)号:US5416189A

    公开(公告)日:1995-05-16

    申请号:US145208

    申请日:1993-11-03

    IPC分类号: C08G69/26 C08G69/28

    CPC分类号: C08G69/265 C08G69/28

    摘要: Process for the synthesis of polyamides by polycondensation in a closed reactor of one or a number of dicarboxylic acids with a diamine compound containing not less than 60 mol % of-m-xylyenediamine, in which all the amount of diamine compound stoichiometrically necessary for the polycondensation reaction is quickly brought into contact with the molten acid, the temperature of the reaction mixture is raised to a value greater than the melting point of the polyamide produced, the pressure is only allowed to rise to a value sufficient to prevent solidification of the reaction mixture and a substantial loss of diamine compound and, at the end of the reaction, the pressure of the reaction mixture is reduced and the polyamide formed is recovered.

    摘要翻译: 在一种或多种二羧酸与含有不低于60mol%的间二甲苯二胺的二胺化合物的闭合反应器中缩聚合成聚酰胺的方法,其中所有量的缩聚所需的化学计量的二胺化合物 反应快速与熔融酸接触,反应混合物的温度升高到大于所生产聚酰胺的熔点的值,压力仅允许上升至足以防止反应混合物固化的值 和二胺化合物的显着损失,并且在反应结束时,反应混合物的压力降低,并且回收形成的聚酰胺。