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.
Type:
Grant
Filed:
August 31, 2018
Date of Patent:
December 8, 2020
Assignee:
Coverstro Deutschland AG
Inventors:
Daniela Cozzula, Andreas Ernst, Matthias Leven, Walter Leitner, Thomas Ernst Mueller, Christoph Guertler, Stefan Wershofen, Gernot Jaeger, Franz Beggel, Jens Langanke
Abstract: The present invention relates to the use of diglycerol esters to enhance the flowability of graphite-containing, thermally conductive polycarbonate compositions. Melt viscosities and melt volume flow rates are improved.
Type:
Grant
Filed:
July 5, 2016
Date of Patent:
November 12, 2019
Assignee:
Coverstro Deutschland AG
Inventors:
Helmut Werner Heuer, Rolf Wehrmann, Anke Boumans, Michael Erkelenz
Abstract: The present invention relates to a process for purifying raw-material gases by fractionation. In particular, the present invention relates to a process for cleansing chlorine gas of bromine.
Type:
Grant
Filed:
February 22, 2018
Date of Patent:
July 3, 2018
Assignee:
COVERSTRO DEUTSCHLAND AG
Inventors:
Alfred Soppe, Juergen Bittner, Thorsten Leidig, Friedhelm Steffens, Knud Werner, Thomas Runowski