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:
Aug. 14, 2001
Filed:
Sep. 15, 2000
Victor Paul Eliu, Lörrach, DE;
Julia Völkel, Grenzach-Wyhlen, DE;
Peter Rohringer, Schönenbuch, CH;
Roger Wolfgang Basler, Binzen, DE;
Brigitte Gerhild Sereinig, Grenzach-Wyhlen, DE;
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Abstract
A process for the preparation of sulphonated distyryl-biphenyl compounds of formula (1), in which R,and R,, independently, are hydrogen, C,-C,-alkyl, C,-C,-alkyl or halogen, and M represents Li, K, an alkaline earth metal or ammonium, characterized by, firstly, reacting a compound of formula (2) with a di- or trialkylamine containing 6-12 carbon atoms in each alkyl group, in a two-phase system consisting of strong aqueous mineral acid and a water immisicible organic solvent and, secondly, reacting the resulting lypophilic ammonium salt with LiOH, KOH, an alkaline earth metal hydroxide, ammonia, a mono-, di- or trialkylamine or a tetraalkylammonium hydroxide, all containing 1-4 carbon atoms in each alkyl group; mono-, di- or tri(C,-C,)alkanolamine, morpholine, piperdine or pyrrolidine.