Invention Grant
- Patent Title: Method for purifying an aliphatic polyester
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Application No.: US16765857Application Date: 2018-11-15
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Publication No.: US11319407B2Publication Date: 2022-05-03
- Inventor: Maximilian Lehenmeier , Norbert Effen , Gabriel Skupin , Rainer Naef
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen am Rhein
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen am Rhein
- Agency: Faegre Drinker Biddle & Reath LLP
- Priority: EP17202538 20171120
- International Application: PCT/EP2018/081401 WO 20181115
- International Announcement: WO2019/096920 WO 20190523
- Main IPC: C08G63/90
- IPC: C08G63/90 ; C08G63/16
Abstract:
The present invention relates to a continuous process for purifying a chain-extended aliphatic polyester constructed from aliphatic dicarboxylic acids and aliphatic diols in a degassing apparatus, wherein the crude polyester is degassed for 3 to 30 minutes at a pressure of 0.01 to 5 mbar in the presence of 1% to 7% by weight, based on the total weight of the crude polyester, of an entraining agent.
Information query
