Abstract: The present invention relates to storage stable aqueous dye dispersions, comprising (a) 2.0 to 30.0% by weight, based on the sum of (a), (b) and (c), of a dye of the formula (3) in which KK is a residue of a coupling component; (b) 0.1 to 20.0 % by weight, based on the sum of (a), (b) and (c), of at least one additive selected from the group consisting of wetting agents, dispersing agents, rheology modifiers, and preservatives; and (c) 50.0 to 97.9% by weight, based on the sum of (a), (b) and (c), of water. The invention moreover relates to a process for their preparation and the use thereof for the dyeing, in particular of paper.

Abstract: The present invention relates to storage stable aqueous dye dispersions, comprising (a) 2.0 to 30.0% by weight, based on the sum of (a), (b) and (c), of a dye of the formula (3) in which KK is a residue of a coupling component; (b) 0.1 to 20.0 % by weight, based on the sum of (a), (b) and (c), of at least one additive selected from the group consisting of wetting agents, dispersing agents, rheology modifiers, and preservatives; and (c) 50.0 to 97.9% by weight, based on the sum of (a), (b) and (c), of water. The invention moreover relates to a process for their preparation and the use thereof for the dyeing, in particular of paper.

Abstract: The invention relates to an aqueous dye solution comprising a) 5 to 30% by weight of an anionic or cationic direct dye, b) 0.01 to 5% by weight of the compound of formula (1), in which M represents hydrogen, an alkali metal or alkaline earth metal, ammonium or ammonium, that is mono-, di-, tri- or tetra-substituted by C1-C4alkyl or C2-C4hydroxyalkyl or mixtures thereof, c) 0 to 10% by weight of an inorganic or an organic acid, d) 0 to 20% by weight of further additives and e) water to complete to 100%, with the proviso that direct dyes of the formula (2) in which K is a residue of a coupling component of the acetoacetanilide, pyridone, pyrazolone or pyrimidine series and M is as defined above, are excluded, a process for their preparation and the use thereof for dyeing paper.

Abstract: The invention relates to an aqueous dye solution comprising a) 5 to 30% by weight of an anionic or cationic direct dye, b) 0.1 to 10% by weight of 1-phenoxy-2-propanol, c) 0 to 20% by weight of an inorganic or an organic acid, d) 0 to 20% by weight of further additives and e) water to complete to 100%, a process for the preparation of the solution and the use thereof for dyeing paper.

Abstract: The present invention relates storage stable aqueous dye solutions comprising a) 5 to 30% by weight of a dye of the formula in which K is a residue of a coupling component of the acetoacetanilide, pyridone, pyrazolone or pyrimidine series and M is hydrogen, an alkali metal or alkaline earth metal, ammonium or alkyl ammonium, b) 0.05 to 5% by weight of one or more compounds of the formula or a residue of the formula in which A, X, Y, R, P and Q are defined herein, c) an organic or an inorganic base or mixtures thereof, d) if desired, further additives and e) water, a process for their preparation and the use thereof for the dyeing, in particular of paper.

Abstract: The present invention provides 6-azo-5,5?-dihydroxy-7,7?-disulfo-2,2?-dinaphthylamine derivatives, their use as dyes, dyed paper and formulations comprising them.

Abstract: The invention relates to an aqueous dye solution comprising a) 5 to 30% by weight of an anionic or cationic direct dye, b) 0.01 to 5% by weight of the compound of formula (1), in which M represents hydrogen, an alkali metal or alkaline earth metal, ammonium or ammonium, that is mono-, di-, tri- or tetra-substituted by C1-C4alkyl or C2-C4hydroxyalkyl or mixtures thereof, c) 0 to 10% by weight of an inorganic or an organic acid, d) 0 to 20% by weight of further additives and e) water to complete to 100%, with the proviso that direct dyes of the formula (2) in which K is a residue of a coupling component of the acetoacetanilide, pyridone, pyrazolone or pyrimidine series and M is as defined above, are excluded, a process for their preparation and the use thereof for dyeing paper.

Abstract: The invention relates to an aqueous dye solution comprising a) 5 to 30% by weight of an anionic or cationic direct dye, b) 0.1 to 10% by weight of 1-phenoxy-2-propanol, c) 0 to 20% by weight of an inorganic or an organic acid, d) 0 to 20% by weight of further additives and e) water to complete to 100%, a process for the preparation of the solution and the use thereof for dyeing paper.

Abstract: The present invention provides 6-azo-5,5?-dihydroxy-7,7?-disulfo-2,2?-dinaphthylamine derivatives, their use as dyes, dyed paper and formulations comprising them.

Abstract: The present invention provides 4,4?-diazobenzanilide derivatives, a process for their preparation, their use as dyes, dyed paper, formulations comprising them and also precursors thereof and their processes of preparation.

Abstract: The dyes of formula (1) according to claim 1 and the copper complexes of dyes of formula (2) according to claim 9 or the mixtures of mono-copper complex with the bis-copper complex are excellently suitable for dyeing paper with good light-fastness properties.

Abstract: The dyes of formula (1) according to claim 1 and the copper complexes of dyes of formula (2) according to claim 9 or the mixtures of mono-copper complex with the bis-copper complex are excellently suitable for dyeing paper with good light-fastness properties.

Abstract: The present invention relates storage stable aqueous dye solutions comprising a) 5 to 30% by weight of a dye of the Formula (1) in which K is a residue of a coupling component of the acetoacetanilide, pyridone, pyrazolone or pyrimidine series and M is hydrogen, an alkali metal or alkaline earth metal, ammonium or alkyl ammonium, b) 0.

Abstract: Described is a process for preparing concentrated solutions or suspensions of anionic organic compounds which comprises a) acidifying an aqueous solution or suspension of an anionic organic compound containing salts and/or impurities to a pH of 4.5 or less, if the pH is above this value, so that b) the anionic organic compound is water-insoluble and precipitates in the form of the free acid, c) bringing the suspension to a salt content below 2% by weight, based on the total weight of the retentate, by means of ultrafiltration with a membrane having pore diameters of from 0.001 to 0.02 ?m, and d) optionally washing out the salts with water having a pH below 4,5, e) optionally carrying out acid-free washing with water thereafter, and then f) concentrating, so that the amount of anionic organic compound is 5-50% by weight, and g) if desired, bringing the anionic organic compound into solution by adding an appropriate base.

Abstract: A process for the preparation of concentrated solutions or suspensions of anionic organic compounds is described, which process comprises a) acidifying an aqueous solution or dispersion of an anionic organic compound that comprises salts and/or impurities to a pH of 4.5 or less, if the pH is above that value, so that the anionic organic compound becomes insoluble in water and precipitates out in the form of the free acid, b) bringing the suspension obtained from the previous step to a salt content below 2% by weight, based on the total weight of retentate, by means of ultra-filtration with a ceramic membrane or an acid-resistant organic membrane having a pore size of from 1 to 20 nm, and c) optionally washing out of the salts with water at a pH of less than 4.

Abstract: The dyes of formula (1) according to claim 1 and the copper complexes of dyes of formula (2) according to claim 9 or the mixtures of mono-copper complex with the bis-copper complex are excellently suitable for dyeing paper with good light-fastness properties.

Abstract: Described is a process for preparing concentrated solutions or suspensions of anionic organic compounds which comprises a) acidifying an aqueous solution or suspension of an anionic organic compound containing salts and/or impurities to a pH of 4.5 or less, if the pH is above this value, so that b) the anionic organic compound is water-insoluble and precipitates in the form of the free acid, c) bringing the suspension to a salt content below 2% by weight, based on the total weight of the retentate, by means of ultrafiltration with a membrane having pore diameters of from 0.001 to 0.02 &mgr;m, and d) optionally washing out the salts with water having a pH below 4,5, e) optionally carrying out acid-free washing with water thereafter, and then f) concentrating, so that the amount of anionic organic compound is 5-50% by weight, and g) if desired, bringing the anionic organic compound into solution by adding an appropriate base.