发明名称 |
VERFAHREN ZUR HERSTELLUNG VON POLYESTERGEGENSTANDE MIT GERINGEN ACETALDEHYDGEHALT |
摘要 |
Disclosed is a process for removing acetaldehyde from polyester which comprises the steps of a) transporting molten polyester to a vented, continuous screw conveyor having a polymer compression zone, b) rotating the screw of said conveyor so as to compress and convey through the extruder the molten polymer for a time of less than 15 minutes and at a temperature of less than 300 DEG C., c) simultaneously with step b), flowing a purge agent into and out of said extruder to thereby remove volatile impurities and avoid appreciable build-up of acetaldehyde, and d) conveying the devolatized polymer melt to a mold wherein an article of manufacture is formed. |
申请公布号 |
DE69621340(D1) |
申请公布日期 |
2002.06.27 |
申请号 |
DE1996621340 |
申请日期 |
1996.07.31 |
申请人 |
EASTMAN CHEMICAL CO., KINGSPORT |
发明人 |
NELSON, WAYNE;CHERRY, CLINTON;OLSEN, GRAY |
分类号 |
B29C47/00;B29C47/76;B29K67/00;C08G63/90;(IPC1-7):C08G63/90;C08G63/183;C08G63/199 |
主分类号 |
B29C47/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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