Anionic dye having high water-fastness
AssigneeImperial Chemical Industries PLC
InventorsDavid Greenwood, Nigel Hughes, Ronald W. Kenyon, Suraj L. Hindagolla
Life of this patent
Estimating the term…
Abstract
A dye which, in the free acid form, has the formula ##STR1## wherein W is COOH X is selected from H, COOH, SO.sub.3 H, halo, hydroxy, nitro, cyano, C.sub.1-6 -alkyl, C.sub.1-6 -alkoxy and C.sub.1-6 -acylamino; Y is H, COOH or SO.sub.3 H; Z is H, COOH or SO.sub.3 H; R & R.sup.1 are each independently H or C.sub.1-6 -alkyl substituted by 0, 1 or 2 --COOR.sup.2 groups; and R.sup.2 is H or C.sub.1-6 -alkyl; provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO.sub.3 H groups. The dye is adapted for the preparation of inks for use in ink jet printing in which it displays high water-fastness on paper.
Claims12
A dye which, in the free acid form, has the formula ##STR5## wherein W is COOH
- X is selected from the group consisting of H, COOH, SO.sub.3 H, halo, nitro, cyano,
- C.sub.1-6 -alkyl, C.sub.1-6 -alkoxy and C.sub.1-6 -acylamino
- Y is H, COOH or SO.sub.3 H;
- and
- Z is H, COOH or SO.sub.3 H;
- provided that there are at least two COOH groups and that the number of COOH groups is equal to or greater than the number of SO.sub.3 H groups.
A dye which, in its free acid form, has the formula ##STR6## wherein Y is H or SO.sub.3 H
- Z is H, COOH or SO.sub.3 H.
Dependencies are inferred from the claim text.