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:
Dec. 08, 2020
Filed:
Aug. 31, 2018
Covestro Deutschland Ag, Leverkusen, DE;
Daniela Cozzula, Sankt Katharinen, DE;
Andreas Ernst, Aachen, DE;
Matthias Leven, Cologne, DE;
Walter Leitner, Aachen, DE;
Thomas Ernst Mueller, Aachen, DE;
Christoph Guertler, Cologne, DE;
Stefan Wershofen, Mönchengladbach, DE;
Gernot Jaeger, Cologne, DE;
Franz Beggel, Cologne, DE;
Jens Langanke, Mechernich, DE;
Coverstro Deutschland AG, Leverkusen, DE;
Abstract
The invention relates to a method for producing an isocyanate, wherein a carbamate or thiolcarbomate is converted, in the presence of a catalyst, with separation of an alcohol or thioalcohol, at a temperature of at least 150° C., to the corresponding isocyanate, wherein a compound of the general formula (X)(Y)(Z—H) is used as a catalyst, in particular characterized in that the compound has both a proton donor function and a proton acceptor function. In the catalysts according to the invention, a separable proton is bound to a heteroatom, which is more electronegative than carbon. Said heteroatom is either identical to Z or a component thereof. In the catalysts according to the invention, there is additionally a proton acceptor function which is either identical to X or a component thereof. According to the invention, the proton donator and proton acceptor function are connected to each other by the bridge Y.