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1. 发明授权

US06887968B2 Process for the recycling of polycarbonates 失效
标题翻译：聚碳酸酯回收工艺
公开(公告)号：US06887968B2
公开(公告)日：2005-05-03
申请号：US10229787
申请日：2002-08-28
申请人： Heinrich Hähnsen , Uwe Hucks , Silke Kratschmer , Manfred Schraut
发明人： Heinrich Hähnsen , Uwe Hucks , Silke Kratschmer , Manfred Schraut
IPC分类号： C08G64/40 , C08G64/42 , C08G64/00
CPC分类号： C08G64/42
摘要： A process for making a high molecular weight (co)polycarbonate resin is disclosed. The process entails (i) obtaining at least one member selected from the group low molecular weight residue (weight average molecular weight 15,000 to 30,000) of aromatic (co)polycarbonate production, waste of (co)polycarbonate production, remainders of (co)polycarbonate production and (co)polycarbonate recyclate (ii) melting the said member in a suitable vessel to obtain a melt and (iii) feeding the melt into a reactor optionally along with at least one bisphenol or oligocarbonate having terminal OH groups and further optionally with a transesterification catalyst, and (iv) subjecting the melt to transesterification reaction at a temperature of 250 to 350° C., at a pressure below 5 mbar and residence time of 0.02-4 hours.
摘要翻译：公开了制备高分子量（共）聚碳酸酯树脂的方法。该方法包括：（i）获得选自芳族（共）聚碳酸酯生产的低分子量残余物（重均分子量为15,000至30,000）中的至少一种，（共）聚碳酸酯生产的废弃物，（共）聚碳酸酯的剩余物生产和（共）聚碳酸酯回收（ii）在合适的容器中熔化所述构件以获得熔体，和（iii）将熔体任选地与至少一种具有末端OH基的双酚或低聚碳酸酯一起进料到反应器中，酯交换催化剂，和（iv）在250-350℃的温度，低于5mbar的压力和0.02-4小时的停留时间下对熔体进行酯交换反应。

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