Process and dye preparations for pad-dyeing
AssigneeCiba-Geigy Corporation
InventorsRoland Putzar, Hans Fierz
Life of this patent
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Abstract
A dye preparation containing at least one dye insoluble or difficultly soluble in water, an anionic or nonionic dispersing agent, at least one metal complex consisting of a polyvalent cation and at least one complexing agent, and optionally further additives, water and/or organic solvent.
Claims19
A storage-stable solid or liquid dye preparation consisting essentially of at least 10% of at least one dye, insoluble or difficultly soluble in water;
- an anionic or nonionic dispersing agent;
- at least one colorless metal complex which is stable in said preparation but unstable and capable of splitting under dyeing conditions at a pH of 3 to 6 and consisting of an alkaline earth metal or trivalent metal cation and at least one polydentate complexing agent;
- alone or in the presence of further biological stabilizing, humectant or thickening additives, water, organic water-miscible solvents or mixtures thereof, said colorless metal complex being present in said solid preparation in an amount of 1 to 60% by weight and in said liquid preparation in an amount of 0.1 to 20% by weight relative to the total preparation.
In a process for dyeing textile material containing polyester or cellulose fibers or mixtures thereof by the application of an aqueous dye-padding liquor containing at least 10% of at least one dye which is insoluble or difficultly soluble in water, an anionic or nonionic dispersing agent, in the presence or absence of further biological stabilizing, humectant or thickening additives, or mixtures thereof, to the textile material, the improvement wherein said padding liquor contains 0.2 to 20 grams per liter of at least one colorless metal complex, of a polyvalent cation and at least one polydentate complexing agent, capable of splitting under a low pH dyeing condition, and adjusting the pH to a value of 3 to 6 to obtain said low pH dyeing condition and control dye migration.
Dependencies are inferred from the claim text.