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:
Mar. 26, 2019
Filed:
Jan. 27, 2016
Covestro Deutschland Ag, Leverkusen, DE;
Jörg Hofmann, Krefeld, DE;
Thomas Ernst Müller, Aachen, DE;
Michael Pohl, Aachen, DE;
Walter Leitner, Aachen, DE;
COVESTRO DEUTSCHLAND AG, Leverkusen, DE;
Abstract
The invention provides a process for preparing polyether carbonate polyols by addition of alkylene oxides and carbon dioxide onto H-functional starter substance in the presence of a double metal cyanide (DMC) catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, wherein (γ) alkylene oxide and carbon dioxide are added onto H-functional starter substance in a reactor in the presence of a double metal cyanide catalyst or in the presence of a metal complex catalyst based on the metals zinc and/or cobalt, wherein a reaction mixture comprising the polyether carbonate polyol is obtained, and wherein (δ) the reaction mixture obtained in step (γ) remains in the reactor or is transferred continuously into a postreactor, wherein the content of free alkylene oxide in the reaction mixture is reduced in each case in the manner of a postreaction, characterized in that a component K is added during the postreaction, component K being selected from at least one compound containing a phosphorus-oxygen-hydrogen group.