Stable liquid formulation
View Patent ↗The present invention concerns concentrated aqueous solutions of an anionic disazo dye, comprising salts and or the free acids of the anionic dye of the formula (I) and 2-(2-butoxyethoxy)ethanol and the use of these solutions for dyeing and/or printing hydroxyl-containing substrates and for producing inkjet inks.
1. A concentrated aqueous solution comprising salts or the free acid of the anionic dye of the formula (I) or both,
2-(2-butoxyethoxy)ethanol and a water-soluble organic solubilizer, wherein the water-soluble organic solubilizer is urea present in an amount of 1-6% by weight.
2. The concentrated aqueous solution according to claim 1 , wherein the concentrated aqueous solution comprises 5% to 40% by weight of the dye of the formula I.
3. The concentrated aqueous solution according to claim 1 , comprising
10-12% by weight of the anionic dye of the formula (I), wherein the anionic dye is in the form of a free acid,
1-8% by weight of 2-(2-butoxyethoxy)ethanol,
1-6% by weight of a water-soluble organic solubilizer and
74-88% by weight of water.
4. An ink jet ink comprising a concentrated aqueous solution according to claim 1 .
5. A method of utilizing a concentrated aqueous solution according to claim 1 for dyeing and/or printing hydroxyl-containing substrates and for producing inkjet inks comprising the step of adding the concentrated aqueous solution to the dyed and/or printed hydroxyl-containing substrate or the inkjet ink during production thereof.
6. A hydroxyl-containing substrate dyed or printed with a concentrated aqueous solution according to claim 1 .
7. The hydroxyl-containing substrate according to claim 6 wherein the hydroxyl-containing substrate is paper.