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. 14, 2010
Filed:
Dec. 13, 2003
Martin Sohn, Mannheim, DE;
Eckhard Stroefer, Mannheim, DE;
Filip Nevejans, St. Gillis-Waas, BE;
Ulrich Penzel, Tettau, DE;
Hans-juergen Pallasch, Ludwigshafen, DE;
Rene Leuthold, Hohenbocka, DE;
Andreas Brodhagen, Bierbeeg, BE;
Andreas Woelfert, Bad Rappenau, DE;
Wolfgang Mackenroth, Bad Duerkheim, DE;
Markus Maurer, Ludwigshafen, DE;
Martin Sohn, Mannheim, DE;
Eckhard Stroefer, Mannheim, DE;
Filip Nevejans, St. Gillis-Waas, BE;
Ulrich Penzel, Tettau, DE;
Hans-Juergen Pallasch, Ludwigshafen, DE;
Rene Leuthold, Hohenbocka, DE;
Andreas Brodhagen, Bierbeeg, BE;
Andreas Woelfert, Bad Rappenau, DE;
Wolfgang Mackenroth, Bad Duerkheim, DE;
Markus Maurer, Ludwigshafen, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.