Invention Grant
- Patent Title: Process for preparing polycarbonates by transesterifying dithiocarbonates or selenium analogues thereof with bisphenols
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Application No.: US15552219Application Date: 2016-02-15
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Publication No.: US10167364B2Publication Date: 2019-01-01
- Inventor: Thomas Ernst Müller , Christoph Gürtler , Nicolai Kolb , Burkhard Köhler , Walter Leitner , Jan Heijl , Alexandra Große Böwing
- Applicant: Covestro Deutschland AG
- Applicant Address: DE Leverkusen
- Assignee: COVESTRO DEUTSCHLAND AG
- Current Assignee: COVESTRO DEUTSCHLAND AG
- Current Assignee Address: DE Leverkusen
- Agency: K&L Gates LLP
- Priority: EP15155655 20150218
- International Application: PCT/EP2016/053113 WO 20160215
- International Announcement: WO2016/131747 WO 20160825
- Main IPC: C08G64/38
- IPC: C08G64/38 ; B01J27/057 ; C08G64/20 ; C08K5/38
Abstract:
The present invention relates to a process for preparing aromatic polycarbonates, comprising the step of reacting bisphenols with dithiocarbonates or selenium analogs thereof in the presence of a catalyst. It further relates to the use of dithiocarbonates or selenium analogs thereof as transesterifying reagents for the preparation of polycarbonates.
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