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公开(公告)号：US10435507B2
公开(公告)日：2019-10-08
申请号：US15789704
申请日：2017-10-20
发明人： Thomas Koenig , Joerg Kirchhoff , Michael Bierdel , Klemens Kohlgrueber , Johann Rechner , Ing. Johan Vaes , Johan Vanden Eynde , Frank Bruynseels , Bert Ruytinx
IPC分类号： C08G64/40 , B29C48/07 , B29C48/13 , B29C48/38 , B29C48/39 , B29C48/40 , B29C48/385 , B29C48/76 , C08G64/20 , B29K69/00
摘要： The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.
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公开(公告)号：US20180105644A1
公开(公告)日：2018-04-19
申请号：US15789704
申请日：2017-10-20
发明人： Thomas Koenig , Joerg Kirchhoff , Michael Bierdel , Klemens Kohlgrueber , Johann Rechner , Ing. Johan Vaes , Johan Vanden Eynde , Frank Bruynseels , Bert Ruytinx
IPC分类号： C08G64/40 , C08G64/20 , B29C47/40 , B29C47/76 , B29C47/50 , B29C47/00 , B29C47/36 , B29K69/00
CPC分类号： C08G64/406 , B29C48/07 , B29C48/13 , B29C48/38 , B29C48/385 , B29C48/39 , B29C48/40 , B29C48/767 , B29K2069/00 , C08G64/205
摘要： The invention relates to polycarbonates with extremely low residual levels of volatile constituents and thermal degradation products, and also improved optical properties, especially Yellowness Index (YI) and good thermal stability, from solvent-containing polymer melts. The invention further relates to an apparatus and a process for preparing these polycarbonates with the aid of a devolatilizing extruder with at least three devolatilizing zones, and zones for introducing entraining agent into dispersion are present upstream of at least three devolatilizing zones.
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