The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2025
Filed:
May. 19, 2020
Applicant:
Basf SE, Ludwigshafen am Rhein, DE;
Inventors:
Timo Benjamin Witt, Ludwigshafen am Rhein, DE;
Norbert Effen, Ludwigshafen am Rhein, DE;
Jerome Lohmann, Ludwigshafen am Rhein, DE;
Motonori Yamamoto, Ludwigshafen am Rhein, DE;
Andreas Kuenkel, Ludwigshafen am Rhein, DE;
Assignee:
BASF SE, Ludwigshafen Am Rhein, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J 8/18 (2006.01); C08G 63/183 (2006.01); C08G 63/80 (2006.01); C08G 63/90 (2006.01); D04H 1/00 (2006.01);
U.S. Cl.
CPC ...
C08G 63/90 (2013.01); C08G 63/183 (2013.01); C08G 63/80 (2013.01);
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.