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. 12, 1996
Filed:
Jul. 19, 1993
Applicant:
Inventors:
Folahan O Ayorinde, Kettering, MD (US);
Chukwuma P Nwaonicha, Adelphi, MD (US);
Assignee:
Howard University, Washington, DC (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C11B / ; C11C / ;
U.S. Cl.
CPC ...
554132 ; 554154 ; 554160 ; 554162 ; 554213 ;
Abstract
Nylon-11 monomer, 11-aminoundecanoic acid, is synthesized from 12-oxododecanoic acid oxime in a three-step reaction sequence which involves a Beckmann rearrangement, Hofmann degradation and hydrolysis. The aldoxime acid is hydrolyzed in the presence of nickel acetate tetrahydrate to give 11-carbamoylundecanoic acid. This amide is then treated with a solution of sodium methoxide and bromine at 70.degree.-80.degree. C. to give 11-(methoxycarbonylamino)undecanoic acid, which upon basic hydrolysis and subsequent neutralization, yields the 11-aminoundecanoic acid.