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:
Jun. 13, 2017
Filed:
Aug. 23, 2013
Covestro Deutschland Ag, Leverkusen, DE;
Thomas Ernst Müller, Aachen, DE;
Christoph Gürtler, Köln, DE;
Jörg Hofmann, Krefeld, DE;
Matthias Wohak, Dormagen, DE;
Stefanie Braun, Köln, DE;
Aurel Wolf, Wülfrath, DE;
Ilja Peckermann, Köln, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The invention relates to a method for producing polyether carbonate polyols by attaching alkylene oxides and carbon dioxide to one or more H-functional starters in the presence of a double-metal cyanide catalyst, characterized in that (alpha) a suspending agent which contains no H-functional groups is provided in a reactor, (ss) optionally, a moiety of alkylene oxide is added to the mixture from step (alpha) at temperatures of 90 to 150 DEG C., and the addition of the alkylene oxide compound is then interrupted; and (gamma) one or more H-functional starters are continuously metered into the reactor during the reaction.