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:
Dec. 07, 2010
Filed:
May. 18, 2005
Gunter-rudolf Schroeder, Mannheim, DE;
Juergen Decker, Dudenhofen, DE;
Helmut Reichelt, Neustadt, DE;
Ingo Klopp, Weisenheim, DE;
Armin Diefenbacher, Germersheim, DE;
Hartwig Voss, Frankenthal, DE;
Gunter-Rudolf Schroeder, Mannheim, DE;
Juergen Decker, Dudenhofen, DE;
Helmut Reichelt, Neustadt, DE;
Ingo Klopp, Weisenheim, DE;
Armin Diefenbacher, Germersheim, DE;
Hartwig Voss, Frankenthal, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for producing a liquid formulation of salts of sulfonated azo dyes by coupling an at least equimolar amount of diazotized aminoarylsulfonic acids IHN—Ar—SOH  (I),where Ar is phenylene (which may be monosubstituted by sulfo) or naphthylene (which may be mono- or disubstituted by sulfo and/or monosubstituted by hydroxyl) onto the coupling product of an unsubstituted or methyl-substituted phenylenediamine with itself comprises dissolving the azo dye in a basic medium and then subjecting the solution to a nanofiltration.