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Westphal; Jochen
Dusseldorf, DE
No. of patents:

Patent Number Title Of Patent Date Issued
4978747 Colorants obtained by reacting a NH.sub.2 -containing dyestuff with a diisocyanate followed by r December 18, 1990
Colorants are obtained by reacting a dyestuff which is free from ionic groups and has.gtoreq.2 NH.sub.2 groups which are preferably arranged in such a manner that they do not participate in the resonance of the chromophore with such an amount of a (cyclo)aliphatic diisocyante so as to
4670548 Sulfo-group-containing trisazo dyestuffs June 2, 1987
Water-soluble dyestuffs of the formulawhereinA denotes sulphophenyl or sulphonaphthyl, which are optionally further substituted,B denotes sulpho-1,4-naphthylene, which is optionally further substituted,C denotes 1,4-phenylene or 1,4-naphthylene, which are optionally further substituted, andK

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