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:
Jul. 23, 2013
Filed:
Aug. 02, 2010
Applicants:
Bernhard Geissler, Kirchheim, DE;
Eckhard Stroefer, Mannheim, DE;
Andreas Schmidt, Schwarzheide, DE;
Matthias Kloetzer, Kroppen, DE;
Inventors:
Bernhard Geissler, Kirchheim, DE;
Eckhard Stroefer, Mannheim, DE;
Andreas Schmidt, Schwarzheide, DE;
Matthias Kloetzer, Kroppen, DE;
Assignee:
BASF SE, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 263/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to an improved multistage process for the continuous preparation of diisocyanates by reaction of the corresponding diamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric urethanes and thermal dissociation of the latter.