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. 30, 2010
Filed:
Jul. 27, 2006
Applicants:
Harald Rögl, Wallern an der Trattnach, AT;
Markus Ungerank, Perg, AT;
Inventors:
Harald Rögl, Wallern an der Trattnach, AT;
Markus Ungerank, Perg, AT;
Assignee:
Evonik Fibres GmbH, Lenzing, AT;
Primary Examiner:
Int. Cl.
CPC ...
C07C 45/30 (2006.01);
U.S. Cl.
CPC ...
Abstract
Process for preparing 4,4'-difluorobenzophenone, characterized in that, in a first step, fluorobenzene is reacted with formaldehyde under catalysis by organic sulphonic acids to give difluorodiphenylmethane, the product obtained is isolated, and, in a second step, oxidized with nitric acid to give 4,4′-difluorobenzophenone. 4,4′-Difluorobenzophenone (4,4′-DFBP) is the central starting material for the preparation of aromatic polyether ketones.