Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Reexamination Certificate
2005-05-18
2010-12-07
Powers, Fiona T (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
C534S676000, C534S679000, C534S887000
Reexamination Certificate
active
07847073
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 Iin-line-formulae description="In-line Formulae" end="lead"?H2N—Ar—SO3H (I),in-line-formulae description="In-line Formulae" end="tail"?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.
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Decker Juergen
Diefenbacher Armin
Klopp Ingo
Reichelt Helmut
Schroeder Gunter-Rudolf
BASF - Aktiengesellschaft
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Powers Fiona T
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