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公开(公告)号：US11319407B2
公开(公告)日：2022-05-03
申请号：US16765857
申请日：2018-11-15
Applicant: BASF SE
Inventor： Maximilian Lehenmeier , Norbert Effen , Gabriel Skupin , Rainer Naef
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.
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