Basf Se Corporation

Ciba Specialty Chemicals Corporation

Ciba Specialty Chemicals Holding, Inc.

Holger Lautenbach

Adolf Käser

Jacek Malisz

Martina Hoffmann

Rainer Kaufel

Elke Polley

Rainer Hans Traber

Michael Heneghan

Adolf K&auml;ser

Heidemarie Urbing

Adolf Kaser

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. 

Aqueous dye dispersions

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 C-Calkyl or C-Chydroxyalkyl 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. 

Aqueous solutions of direct dyes

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.

1-phenoxy-2-propanol as a formulating aid for dyes

The present invention relates storage stable aqueous dye solutions comprising 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, or a residue of the formula in which

Aqueous dye solutions

The present invention provides 6-azo-5,5'-dihydroxy-7,7&#x2032;-disulfo-2,2&#x2032;-dinaphthylamine derivatives, their use as dyes, dyed paper and formulations comprising them.

6-azo-5,5'-dihydroxy-7,7&#x2032;-disulfo-2-2&#x2032; dinaphthylamine derivatives

The dyes of formula (1) according to claimand the copper complexes of dyes of formula (2) according to claimor the mixtures of mono-copper complex with the bis-copper complex are excellently suitable for dyeing paper with good light-fastness properties.

Disazo dyes, and copper complexes thereof, for dyeing paper

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 &#x3bc;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.

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Rheinfelden, Germany

Holger Lautenbach