Biscationic azo dyes useful for dyeing or printing polymeric material have the formula [Figure] where R1 is hydrogen or unsubstituted or phenyl-substituted C1-C5-alkyl, R2 is hydrogen or C1-C5-alkyl, R3 and R4 are independently of each other hydrogen or methyl, D is the radical of a diazo component,
Biscationic azo dyes useful for dyeing or printing polymeric material have the formula [Figure] where R1 is hydrogen or unsubstituted or phenyl-substituted C1-C5-alkyl, R2 is hydrogen or C1-C5-alkyl, R3 and R4 are independently of each other hydrogen or methyl, D is the radical of a diazo component, unsubstituted or substituted phenylene or a radical of the formula [Figure] where Z is a bridge member, Y is hydrogen, C1-C18-alkyl, C2-C6-alkylene, xylidene or phenylene, An
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A biscationic azo dye of the formula: [Figure] wherein R1 is hydrogen or unsubstituted or phenyl-substituted C1-C5-alkyl, R2 is hydrogen or C1-C5-alkyl, R3 and R4 are identical or different and each is independently hydrogen or methyl D is a radical of a sulfo-devoid aromatic or heteroaromatic diazo
A biscationic azo dye of the formula: [Figure] wherein R1 is hydrogen or unsubstituted or phenyl-substituted C1-C5-alkyl, R2 is hydrogen or C1-C5-alkyl, R3 and R4 are identical or different and each is independently hydrogen or methyl D is a radical of a sulfo-devoid aromatic or heteroaromatic diazo component, unsubstituted or C1-C4-alkyl- or C1-C4-alkoxy-substituted 1,4-phenylene or a radical of the formula: [Figure] wherein Z is C2-C6-alkylene, C2-C6-alkylenoxy or a radical of the formula -CH〓CH-, -NH-CO-, -N〓N-, -NH-CO-NH-, [Figure] [Figure] Y is hydrogen, C1-C18-alkyl, C2-C6-alkylene, xylidene or phenylene, Anis an anion m is 1 or 2, and n is 1 or 2, with the proviso that a) in the case of Y being hydrogen or C1-C18-alkyl, m is 2, n is 1 and D is unsubstituted or C1-C4-alkyl- or C1-C4-alkoxy-substituted 1,4-phenylene or a radical of the formula [Figure] and b) in the case of Y being C2-C6-alkylene, xylidene or phenylene, m is 1, n is 2 and D is a radical of a sulfo-devoid aromatic or heteroaromatic diazo component. A method of dyeing or printing polymeric material comprising immersing said polymeric material in a solution of the biscationic azo dye as claimed in claim 1.
Ruske Manfred,DEX ; Erk Peter,DEX ; Hengelsberg Heidi,DEX, Clathrate of bis [6-hydroxy-4-methyl-5-(3-methyl-imidazolium-1-yl) -3-(phen-4-ylazo) pyridin-2-one] ethylene and an aro.
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