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:
Sep. 17, 2013
Filed:
May. 18, 2009
Gerda Grund, Coesfeld, DE;
Manfred Kreczinski, Herne, DE;
Stephan Kohlstruk, Duelmen, DE;
Christian Lettmann, Coesfeld, DE;
Gerda Grund, Coesfeld, DE;
Manfred Kreczinski, Herne, DE;
Stephan Kohlstruk, Duelmen, DE;
Christian Lettmann, Coesfeld, DE;
Evonik Degussa GmbH, Essen, DE;
Abstract
Low chlorine, multi-staged method for producing cycloaliphatic diisocyanates. The invention relates to a multi-staged method for the continuous low-chlorine production of cycloaliphatic diisocyanates, comprising the synthesis of diaminodipheynl alkanes, the hydration thereof into the corresponding cycloaliphatic diamines and the subsequent conversion of cycloaliphatic diamines to the corresponding cycloalkylene biscarbamates and the thermal cleaving of the latter into the cycloaliphatic diisocyanates and alcohol.