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:
Aug. 28, 2012
Filed:
Jan. 29, 2009
Applicants:
Volker Brehme, Nottuln-Appelhuelsen, DE;
Daniel Dembkowski, Essen, DE;
Inventors:
Volker Brehme, Nottuln-Appelhuelsen, DE;
Daniel Dembkowski, Essen, DE;
Assignee:
Evonik Degussa GmbH, Essen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07D 211/00 (2006.01); C07D 211/56 (2006.01);
U.S. Cl.
CPC ...
Abstract
4-amino-2,2,6,6-tetramethylpiperidine is prepared by reacting 2,2,6,6-tetramethylpiperidine-4-one with ammonia and hydrogen in the presence of nickel and/or cobalt catalyst and water. The main reaction is carried out at a pressure of at most 50 bar and a temperature of at most 120° C. up to a conversion of the 2,2,6,6-tetramethylpiperidine-4-one of at least 80%. Then, an after-reaction takes place at a higher temperature and at a higher pressure compared to the pressure and temperature of the main reaction.