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    • 7. 发明专利
    • PRODUCTION OF POLYAMIDE
    • JPH09104751A
    • 1997-04-22
    • JP26314095
    • 1995-10-11
    • MITSUBISHI GAS CHEMICAL CO
    • HAYASHI TAKEOYAMAMOTO KOJI
    • C08G69/28
    • PROBLEM TO BE SOLVED: To produce a polyamide very advantageously by elevating the temp. of a mixture comprising a dicarboxylic acid component and a diamine component in a molar ratio lower than 1 under normal pressure in the substantial absence of a solvent, further adding the dicarboxylic acid component to the mixture, and conducting the polycondensation of the obtained mixture. SOLUTION: The temp. of a mixture comprising a dicarboxylic acid component and a diamine component in a molar ratio of 0-0.8 is elevated in the substantial absence of a solvent under normal pressure and the dicarboxylic acid component is further added to the mixture to conduct the polycondensation of the obtained mixture. The resultant polyamide is pref. a crystalline one having an m.p. of 330 deg.C or lower or an amorphous one (i.e., is required to be melt-polymerizable). The diamine component pref. contains 80mol% or higher at least one diamine selected from among 4-20C aliph. diamines, xylylenediamine, bis(aminomethyl)cyclohexane, and bis(aminomethyl)naphthalene.