Organic compounds -- part of the class 532-570 series – Organic compounds – Azoxy
Patent
1989-06-19
1991-08-20
Lee, Mary C.
Organic compounds -- part of the class 532-570 series
Organic compounds
Azoxy
534571, 534585, 534689, 534728, 534887, C09B 2700, D21H 2128
Patent
active
050415395
ABSTRACT:
The invention relates to a process for the preparation of concentrated storage-stable aqueous solutions of yellow azo- and azoxystilbene dyes which are obtained by self-condensation of 4-nitrotoluene-2-sulfonic acid in the presence of an alkali metal hydroxide, by converting the sparingly soluble alkali metal salt of the dye into a water-soluble ammonium salt by double cation exchange via a lipophilic ammonium salt, which process comprises carrying out the double ion exchange in a two-phase system of nitrobenzene/water and using, for the first ion exchange a di- or trialkylamine containing a total of 12 to 40 carbon atoms and, for the second ion exchange, a mono-, di- or trialkanolamine containing 2 to 4 carbon atoms in each alkyl moiety.
The concentrated storage-stable dye solutions so obtained are particularly suitable for dyeing paper.
REFERENCES:
patent: 3679353 (1972-07-01), Streck
patent: 4560745 (1985-12-01), Weberndoerfer et al.
Kawasaki et al., Chemical Abstracts, vol. 86, #191321p (1977).
Sumitomo, Chemical Abstracts, vol. 96, No. 36800g (1982).
Herzig Paul
Markert Jurgen
Tzikas Athanassios
Ciba-Geigy Corporation
Dohmann George R.
Lee Mary C.
McC. Roberts Edward
Powers Fiona T.
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