| 摘要 |
The invention relates to a process for increasing the molecular weight of a polyamide via solid-state post-condensation by exposing the polyamide in the solid-state at elevated temperature to an inert gas atmosphere, that comprises a step (a) wherein the gas atmosphere to which the polyamide is exposed has a dew temperature T<SUB>dew-1</SUB>, followed by a step (b) wherein the gas atmosphere to which the polyamide is exposed has a dew temperature T<SUB>dew-2</SUB>, whereby T<SUB>dew-1 </SUB>is higher than T<SUB>dew-2</SUB>. The effect is that a high molecular weight polyamide can be obtained in a shorter production time.
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