发明授权
- 专利标题： Increasing the molecular weight of polyesters
- 专利标题（中）： 提高聚酯的分子量
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申请号： US09673742申请日： 2000-10-19
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公开(公告)号： US06265533B1公开(公告)日： 2001-07-24
- 发明人: Karin Regel , Roland Andernach , Peter Schwarz , Heinz Herbst , Kurt Hoffmann , Rudolf Pfaendner , Dirk Simon
- 申请人： Karin Regel , Roland Andernach , Peter Schwarz , Heinz Herbst , Kurt Hoffmann , Rudolf Pfaendner , Dirk Simon
- 优先权： CH939/98 19980424
- 主分类号： C08F600
- IPC分类号： C08F600
摘要：
This invention relates to a process for increasing the molecular weight of polyesters, copolyesters or polyester blends by adding an organic phosphate to the processing apparatus and fusing the mixture to above the melting point, in which process the processing apparatus is a single-screw extruder, twin-screw extruder, planetary-gear extruder, ring extruder or co-kneader having at least one vent zone to which underpressure is applied.
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