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:
Apr. 10, 2007
Filed:
Mar. 17, 2003
Urs Welz-biermann, Heppenheim, DE;
Nikolai Ignatyev, Duisburg, DE;
Michael Weiden, Darmstadt, DE;
Udo Heider, Winchester, GB;
Andri Kucheryna, Duisburg, DE;
Helge Willner, Muehlheim/Ruhr, DE;
Peter Sartori, Utting, DE;
Urs Welz-Biermann, Heppenheim, DE;
Nikolai Ignatyev, Duisburg, DE;
Michael Weiden, Darmstadt, DE;
Udo Heider, Winchester, GB;
Andri Kucheryna, Duisburg, DE;
Helge Willner, Muehlheim/Ruhr, DE;
Peter Sartori, Utting, DE;
Merck Patent GmbH, Darmstadt, DE;
Abstract
The present invention relates to a process for the preparation of bis(perfluoroalkyl)phosphinic acids comprising at least the reaction of at least one difluorotris(perfluoroalkyl)phosphorane or at least one trifluorobis(perfluoroalkyl)phosphorane with hydrogen fluoride in a suitable reaction medium, and heating of the resultant reaction mixture. The invention also relates to salts of bis(perfluoroalkyl)phosphinic acids and to the use thereof.