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:
Mar. 19, 2013
Filed:
May. 16, 2008
Applicants:
Robert Henry Carr, Bertem, BE;
Peter Muller, SM Hellevoetsluis, NL;
Rabah Mouazer, Wavre, BE;
Inventors:
Assignee:
Huntsman International LLC, The Woodlands, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 211/00 (2006.01); C07C 265/00 (2006.01); C07C 263/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series, and to the preparation of di- and polyisocyanates of the diphenylmethane series from these di- and polyamines. The di- and polyamines of the diphenylmethane series are prepared by the reaction of aniline and formaldehyde in the presence of hydrochloric acid. In the present invention, the formaldehyde employed is used as an aqueous solution which contains less than 0.001 wt % of metal ions which are divalent and/or more than divalent.