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. 02, 1992
Filed:
Sep. 04, 1990
Applicant:
Inventors:
Allan A Eisenbraun, Baton Rouge, LA (US);
Venkataraman Ramachandran, Baton Rouge, LA (US);
Assignee:
Ethyl Corporation, Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C07C / ; C07C / ; C07F / ;
U.S. Cl.
CPC ...
562436 ; 556436 ; 560 36 ; 562430 ; 562432 ; 562441 ; 564328 ; 568 25 ; 568306 ; 568316 ; 568323 ;
Abstract
A process for preparing nitro substituted polyarylketones of the formula: ##STR1## is disclosed. The process involves the condensation of ##STR2## where R.sub.A is hydrogen, --COOH, or C.sup.1 to C.sub.12 linear or branched alkyl, Y and Y' are the same or different and are a chemical bond ##STR3## or --Si(CH.sub.3).sub.2 -- and m is 0 or 1 and X is halo. These nitro groups of these compounds can be reduced to provide the corresponding amines, which are useful for the preparation of thermally stable high melting polyimides.