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. 18, 2015
Filed:
Dec. 31, 2012
Basf SE, Ludwigshafen, DE;
Ulrich Berens, Binzen, DE;
Holger Ganz, Ludwigshafen, DE;
Franz Niklaus Windlin, Heidelberg, DE;
Walid Al-Akhdar, Oberwil, CH;
BASF SE, Ludwigshafen, DE;
Abstract
A method of purifying an organic diphosphite of general formula (I) The method comprises providing a crude organic diphosphite of general formula (I) that is at least partly dissolved in a first solvent (L1), wherein (L1) is selected from the group consisting of alkylbenzenes, aryl alkyl ethers, chlorobenzene, and mixtures thereof, and precipitating by admixing with a second solvent (L2) selected from the group consisting of linear C-C-alkanols, ethylene glycol di(C-C-alkyl) ethers, and mixtures thereof, and separating off the precipitated organic diphosphite from the solvents.