| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyamide resin having a reduced low molecular weight component causing mold staining, mold failure or the like at molding, and to provide a process for producing the resin. SOLUTION: The process for producing the polyamide resin, which uses a batch melt polymerization vessel, comprises the following steps: (1) melting a dicarboxylic acid component which is adipic acid in 60 mol% or more; (2) continuously or intermittently starting to add a diamine component with a boiling point of 200°C or higher under polymerization pressure to a dicarboxylic acid component in a molten state at 200°C or below in the absence of solvent; and (3) keeping the temperature of the reaction system at 200°C or below at least until the molar ratio (diamine component/dicarboxylic acid component) reaches 0.1. COPYRIGHT: (C)2005,JPO&NCIPI
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