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:
May. 05, 2009
Filed:
Jan. 24, 2007
Applicants:
Fritz Pohl, Brunsbuttel, DE;
Jeffrey Bolton, Dusseldorf, DE;
Richard Adamson, Leichlingen, DE;
Heinz-herbert Muller, Krefeld, DE;
Rudolf Uchdorf, Shanghai, CN;
Inventors:
Fritz Pohl, Brunsbuttel, DE;
Jeffrey Bolton, Dusseldorf, DE;
Richard Adamson, Leichlingen, DE;
Heinz-Herbert Muller, Krefeld, DE;
Rudolf Uchdorf, Shanghai, CN;
Assignee:
Bayer MeterialScience AG, Leverkusen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 209/78 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention provides an improved process for preparing diamines and polyamines from the diphenylmethane series by reacting aniline and formaldehyde in the presence of an acid catalyst, the improvement involving the aniline containing less than about 3 wt. % of diamines and polyamines from the diphenylmethane series, based on the weight of the aniline.