| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for solid phase polymerization of polyamide, by which an increase in the yellowing degree is small upon the solid phase polymerization of the polyamide that comprises a diamine containing 70 mol% or more of xylylene diamine and a dicarboxylic acid containing 70 mol% or more of adipic acid. SOLUTION: The method for the solid phase polymerization of the polyamide comprises obtaining a raw material polyamide by polycondensation of the diamine containing 70 mol% or more of xylylene diamine and the dicarboxylic acid containing 70 mol% or more of adipic acid via melt polymerization, storing the raw material polyamide once, and then further increasing the degree of polymerization of the polyamide by the solid phase polymerization, wherein the raw material polyamide is stored in air under conditions of relative humidity of 5%RH or less and a temperature less than Tg (the glass transition point of the raw material polyamide) while shielding light and the solid phase polymerization is performed within 20 days including days for storage after obtaining the raw material polyamide. COPYRIGHT: (C)2008,JPO&INPIT
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