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. 24, 2013
Filed:
Apr. 20, 2010
Eckhard Stroefer, Mannheim, DE;
Heiner Schelling, Kirchheim, DE;
Robert Reinhardt, Meckenheim, DE;
Michael Zoellinger, Eislingen, DE;
Daniel Breuninger, Bobenheim-Roxheim, DE;
Markus Kraemer, Radeburg, DE;
Kai Thiele, Antwerpen, BE;
Peter Van Den Abeel, Brasschaat, BE;
Eckhard Stroefer, Mannheim, DE;
Heiner Schelling, Kirchheim, DE;
Robert Reinhardt, Meckenheim, DE;
Michael Zoellinger, Eislingen, DE;
Daniel Breuninger, Bobenheim-Roxheim, DE;
Markus Kraemer, Radeburg, DE;
Kai Thiele, Antwerpen, BE;
Peter Van Den Abeel, Brasschaat, BE;
BASF SE, Ludwigshafen, DE;
Abstract
The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is <10 000 ppm, based on all compounds present in the process. The invention further relates to the phosgenation of MDA to methylenediphenyl diisocyanate (MDI).