Metal complex dyestuffs
AssigneeBayer Aktiengesellschaft
InventorsWinfried Mennicke, Peter Suchanek, Peter F. Vogt
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Abstract
1:2 METAL COMPLEX DYES IN THE FORM OF THE LITHIUM SALTS AND CONCENTRATED SOLUTIONS THEREOF ARE USED FOR THE PREPARATION OF DYE BATHS AND PRINTING PASTES FOR DYEING AND PRINTING FIBROUS MATERIALS CONTAINING NITROGEN. The concentrated solutions are obtained by chromating the non-metallized dyes in hydroxyl group containing solvents in the presence of alkaline lithium salts with chromium acetate or chromium formate.
Claims18
The lithium salt of a 1:2 chromium or 1:2 cobalt complex of a monoazo or azomethine dyestuff which before metallization contains a O,O'-dihydroxy-O-hydroxy-O'-amino-azo or -azomethine group.
A concentrated solution comprising 10-40% by weight of the metal complex dyestuff of claim 1, 0-50% by weight of water, 20-80% by weight of an organic solvent containing at least one hydroxyl group, and 2-12% by weight of a lithium salt which is alkaline in water.
Process for the preparation of concentrated solutions of 1:2-azo- and azomethine complex dyestuffs, characterized in that the metallisable dyestuffs are chromated in hydroxyl group containing solvents in the presence of alkaline lithium salts with chromium acetate or chromium formate.
Lithium salt of the cobalt complex of the dyestuff of the formula ##STR112##
Lithium salt of the chromium complex of the mixtures of the dyestuffs of the formulae ##STR113##
Lithium salt of the chromium complex of the mixtures of the dyestuffs of the formulae ##STR114##
Lithium salt of the chromium complex of the mixtures of the dyestuffs of the formulae ##STR115##
Lithium salt of the chromium complex of the mixtures of the dyestuffs of the formulae ##STR116##
Dependencies are inferred from the claim text.