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:
Oct. 14, 2014
Filed:
Sep. 09, 2010
Torsten Mattke, Freinsheim, DE;
Matthias Kloetzer, Kroppen, DE;
Eckhard Stroefer, Mannheim, DE;
Bernhard Geissler, Kirchheim, DE;
Peter Zehner, Weisenheim am Berg, DE;
Torsten Mattke, Freinsheim, DE;
Matthias Kloetzer, Kroppen, DE;
Eckhard Stroefer, Mannheim, DE;
Bernhard Geissler, Kirchheim, DE;
Peter Zehner, Weisenheim am Berg, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to a multistage process for the continuous preparation of organic, distillable polyisocyanates, preferably diisocyanates, particularly preferably aliphatic or cycloaliphatic diisocyanates, by reaction of the corresponding organic polyamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric polyurethanes and thermal dissociation of the latter, in which the polyisocyanates produced and unusable residues are separated off at particular stages of the reaction and reusable by-products and intermediates are recirculated to preceding stages.