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:
Jun. 05, 2012
Filed:
Aug. 08, 2007
Matthias Kloetzer, Kroppen, DE;
Heinrich-josef Blankertz, Forst, DE;
Gunter Georgi, Lauchhammer, DE;
Eckhard Stroefer, Mannheim, DE;
Volker Krase, Lauchhammer, DE;
Gerhard Schulz, Bad Duerkheim, DE;
Andreas Warzecha, Lauchhammer-Mitte, DE;
Matthias Kloetzer, Kroppen, DE;
Heinrich-Josef Blankertz, Forst, DE;
Gunter Georgi, Lauchhammer, DE;
Eckhard Stroefer, Mannheim, DE;
Volker Krase, Lauchhammer, DE;
Gerhard Schulz, Bad Duerkheim, DE;
Andreas Warzecha, Lauchhammer-Mitte, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to a multistage process for the continuous preparation of organic, distillable isocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic amines with urea and alcohols to liberate ammonia and form low molecular weight monomeric urethanes and thermal dissociation of the latter, in which by-products formed are at least partly utilized.