Organic compounds -- part of the class 532-570 series – Organic compounds – Azo
Reexamination Certificate
2003-11-17
2009-02-10
Powers, Fiona T (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Azo
C534S679000
Reexamination Certificate
active
07488810
ABSTRACT:
A process for preparing a liquid formulation of salts of sulfonated azo dyes, comprising a) preparing vesuvin from m-phenylenediamine; b) without interveningly isolating the vesuvin 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 naphthalene (which may be mono- or disubstituted by sulfo and/or monosubstituted by hydroxyl) onto vesuvin and c) isolating the dyes in their acid form and subsequently dissolving them in aqueous bases.
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Reichelt Helmut
Schmitt Michael
BASF - Aktiengesellschaft
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Powers Fiona T
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