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:
Feb. 03, 2015
Filed:
May. 13, 2011
Christoph Gürtler, Köln, DE;
Jörg Hofmann, Krefeld, DE;
Aurel Wolf, Wülfrath, DE;
Stefan Grasser, Leverkusen, DE;
Christoph Gürtler, Köln, DE;
Jörg Hofmann, Krefeld, DE;
Aurel Wolf, Wülfrath, DE;
Stefan Grasser, Leverkusen, DE;
Bayer Intellectual Property GmbH, Monheim, DE;
Abstract
The present invention relates to a process for the preparation of polyether carbonate polyols from one or more H-functional starter substances, one or more alkylene oxides and carbon dioxide in the presence of at least one double metal cyanide catalyst, wherein the cyanide-free metal salt, the metal cyanide salt or both the mentioned salts used for the preparation of the double metal cyanide catalyst contain(s) from 0.3 to 1.8 mol base equivalents (based on 1 mol of the metal cyanide salt used for the synthesis of the catalyst) of alkaline metal hydroxide, metal carbonate and/or metal oxide.