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:
Jan. 06, 1976
Filed:
May. 23, 1972
Applicant:
Inventors:
Willi Eifler, Schildgen, DT;
Roderich Raue, Leverkusen-Wiesdorf, DT;
Ernst-Heinrich Rohe, Leverkusen, DT;
Josef Finkel, Cologne-Stammheim, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen Bayerwerk, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07c / ;
U.S. Cl.
CPC ...
2605 / ; 260 / ; 2604 / ;
Abstract
A process for the production of aromatic polyamines comprising condensing primary or secondary aromatic amines with formaldehyde or a formaldehyde precursor in the presence of an acid catalyst and liberating the polyamines on completion of condensation by the addition of a basically reacting reagent, wherein a mixture containing amine, catalyst, aldehyde, precondensates formed therefrom, and water, issuing from a mixer at a maximum temperature of about 40.degree.C., is separated into