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AssigneeBASF SE
InventorsAllan Francis Cunningham, Céline Hossenlopp, Heinz Schneider, Rainer Hans Traber, Horst Herrmann, Michael Jacquier
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The present invention relates to an aqueous direct dye formulation, comprising (a) 5 to 25% by weight of a dye composition comprising (a1) 50-99% by weight of one or more dyes obtainable by reduction or thermal treatment of Direct Yellow 11, and (a2) 1-50% by weight of a blue, black and/or red direct dye, (all based on the dye composition); (b) up to 0.9% by weight of a saturated, cyclic or acyclic water-soluble amine comprising a primary, secondary or tertiary amino group and at least one further functional group selected from primary, secondary and tertiary amino groups, OH groups and ether groups; and (c) up to 0.9% by weight of urea; and (d) water, wherein the percentages for (a), (b), and (c) relate to the total weight of the aqueous direct dye formulation. The invention moreover relates to a process for their preparation and the use thereof for the dyeing, in particular of paper, as well as paper which has been dyed with this aqueous direct dye formulation.
An aqueous direct dye formulation, comprising
A process for the preparation of dye formulations, which comprises mixing a2) 1-50% by weight of a blue, black and/or red direct dye to a1) 50-99% by weight of a dye or mixture of dyes obtainable by reduction or thermal treatment of Direct Yellow 11, and, optionally, water,
Dependencies are inferred from the claim text.