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. 17, 1992
Filed:
Mar. 21, 1991
Applicant:
Inventors:
Gerald J O'Neill, Arlington, MA (US);
Albert H Levesque, Nashua, NH (US);
Assignee:
W.R. Grace & Co.-Conn., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564491 ; 564492 ;
Abstract
Polyamines are prepared via the batchwise hydrogenation of polynitriles by the gradual addition of the polynitrile into a fed-batch reactor which contains chromium promoted Raney.RTM. cobalt catalyst. The hydrogenation optionally is conducted in the presence of anhydrous ammonia. The polyamine product having amino groups which corresponds to the nitrile of the polynitrile is economically obtained in high selectivity and yield as the dominant product.