发明名称 |
Solid-state post-condensation process for increasing the molecular weight of a polyamide |
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 Tdew-1, followed by a step (b) wherein the gas atmosphere to which the polyamide is exposed has a dew temperature Tdew-2, whereby Tdew-1 is higher than Tdew-2. The effect is that a high molecular weight polyamide can be obtained in a shorter production time.
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申请公布号 |
EP1331236(A1) |
申请公布日期 |
2003.07.30 |
申请号 |
EP20020075325 |
申请日期 |
2002.01.25 |
申请人 |
DSM IP ASSETS B.V. |
发明人 |
CROMBACH, ROBERT CONRAD BARBARA;RULKENS, RUDY |
分类号 |
C08G69/04;C08G69/06;C08G69/28;C08G69/30;(IPC1-7):C08G69/04 |
主分类号 |
C08G69/04 |
代理机构 |
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主权项 |
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地址 |
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