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. 05, 2016
Filed:
Mar. 24, 2011
Christoph Gürtler, Köln, DE;
Jörg Hofmann, Krefeld, DE;
Thomas Ernst Müller, München, DE;
Aurel Wolf, Wülfrath, DE;
Stefan Grasser, Leverkusen, DE;
Burkhard Köhler, Zierenberg, DE;
Christoph Gürtler, Köln, DE;
Jörg Hofmann, Krefeld, DE;
Thomas Ernst Müller, München, DE;
Aurel Wolf, Wülfrath, DE;
Stefan Grasser, Leverkusen, DE;
Burkhard Köhler, Zierenberg, DE;
Covestro Deutschland AG, , DE;
Abstract
The present invention relates to a process for the preparation of polyether carbonate polyols by catalytic copolymerization of carbon dioxide (CO) with alkylene oxides in the presence of one or more H-functional starter substances with the aid of double metal cyanide (DMC) catalysts and in the presence of additives A) chosen from the group consisting of sterically non-hindered phenols, catechols, pyrocatechols, thiazines, phenothiazines, thiazoles, benzothiazoles, oxazines, phenoxazines, 2,2,6,6-tetramethylpiperidine 1-oxyl and nitrostyrenes and optionally in the presence of metal salts B).