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:
Jun. 23, 1992
Filed:
Sep. 13, 1990
Applicant:
Inventors:
Guo-shuh J Lee, Midland, MI (US);
V Rao Durvasula, Lake Jackson, TX (US);
George E Hartwell, Midland, MI (US);
Kirk D Anderson, Brazoria, TX (US);
Louis N Moreno, Lake Jackson, TX (US);
Nirad N Shah, Lake Jackson, TX (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564409 ; 564307 ; 564308 ; 564420 ; 564430 ;
Abstract
Aromatic diamines, such as toluenediamine, are alkylated in the ortho position by heating the diamine in the presence of an aluminum alloy, aluminium chloride and, optionally, zinc, and then reacting with an alkene at elevated temperatures and pressures.