公开(公告)号：US20220033645A1

公开(公告)日：2022-02-03

申请号：US17311177

申请日：2019-12-05

Applicant: BASF SE

Inventor： Jerome LOHMANN ,  Maximilian LEHENMEIER ,  Norbert EFFEN ,  Martin BUSSMANN ,  Michael Bernhard SCHICK ,  Timo Benjamin WITT

IPC: C08L67/02

Abstract: The present invention relates to a process for producing a (co)polyester, wherein the (co)polyester at least partially consists of 1,4-butylene dicarboxylate units, in a degassing plant, wherein the crude (co)polyester is degassed in the presence of 0.1% to 5% by weight, based on the total weight of the input materials, of an entraining agent at a pressure between 5 to 300 mbar.

公开(公告)号：US20220195113A1

公开(公告)日：2022-06-23

申请号：US17612246

申请日：2020-05-19

Applicant: BASF SE

Inventor： Timo Benjamin WITT ,  Norbert EFFEN ,  Jerome LOHMANN ,  Motonori YAMAMOTO ,  Andreas KUENKEL

IPC: C08G63/90 ,  C08G63/183 ,  C08G63/80

Abstract: The present invention relates to a continuous process for purifying an aliphatic-aromatic polyester constructed from aliphatic dicarboxylic acids, aromatic 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.