Aqueous solutions of direct dyes
AssigneeBASF SE
InventorsHolger Lautenbach, Adolf Käser
Life of this patent
Estimating the term…
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.
Claims4
A storage stable aqueous dye solution consisting of:
- a) 5 to 30% by weight of an anionic or cationic direct dye;
- b) 0.01 to 5% by weight of a compound of formula (1)
- wherein
- M is 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, said further additives selected from the group consisting of water-soluble organic solubilizers, hydrotropic agents, viscosity regulators, dispersing agents, microbiocides, and pH adjusting agents;
- and
- e) water to complete to 100%;
- with the proviso that direct dyes of formula (2)
- wherein
- K is a residue of a coupling component of an acetoacetanilide, a pyridone, a pyrazolone, or a pyrimidine;
- and
- M is as defined above,
- are excluded.
Dependencies are inferred from the claim text.