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. 14, 2007
Filed:
Aug. 06, 2003
Frank Funke, Ludwigshafen, DE;
Thomas Hill, Ludwigshafen, DE;
Jobst Rüdiger Von Watzdorf, Mannheim, DE;
Wolfgang Mattmann, Limburgerhorf, DE;
Wolfgang Harder, Weinheim, DE;
Erhard Henkes, Einhausen, DE;
Gerd Littmann, Weinheim, DE;
Manfred Julius, Limburgerhof, DE;
Frank Funke, Ludwigshafen, DE;
Thomas Hill, Ludwigshafen, DE;
Jobst Rüdiger Von Watzdorf, Mannheim, DE;
Wolfgang Mattmann, Limburgerhorf, DE;
Wolfgang Harder, Weinheim, DE;
Erhard Henkes, Einhausen, DE;
Gerd Littmann, Weinheim, DE;
Manfred Julius, Limburgerhof, DE;
BASF Aktiengesellschaft, , DE;
Abstract
The invention relates to processes for preparing 3-aminomethyl-3,5,5-trimethylcyclo-hexylamine (isophoronediamine, IPDA) having a high cis/trans isomer ratio. IPDA having a cis/trans isomer ratio in the range from 63/37 to 66/34 can be obtained in any desired cis/trans isomer ratio, irrespective of temperature, by reacting IPDA with Hand NHin the presence of a hydrogenation catalyst. IPDA having a cis/trans isomer ratio of at least 73/27 which is an important starting material for the synthesis of polyurethanes and polyamides can be obtained by combining this isomerization process with distillative processes.