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:
Apr. 08, 1980
Filed:
Aug. 04, 1978
Abstract
Aliphatic, linear, saturated or unsaturated .alpha.,.omega.-diamines, conning from 8 to 12 carbon atoms, are prepared from the corresponding .alpha.,.omega.-dialdehydes by firstly converting the dialdehyde to di-imine by reaction with ammonia at less than 25.degree. C. and preferably less than 5.degree. C. in a mixture of water and of an organic solvent, and subsequently subjecting the di-imine to reduction with hydrogen in the presence of a catalyst which under the reaction conditions is capable of reducing all the iminic double bonds while leaving any olefinic bonds unchanged. When olefinic bonds are present and it is desired to obtain a saturated diamine, the unsaturated diamine obtained as hereinbefore stated is subjected to hydrogenation in the presence of a catalyst chosen among palladium, platinum, ruthenium and rodium. Preferred catalysts for the reduction of the di-imine are finely subdivided nickel and cobalt.