Anionic dye
AssigneeImperial Chemical Industries PLC
InventorsDavid Greenwood, Nigel Hughes, Ronald W. Kenyon, Suraj L. Hindagolla
Life of this patent
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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.
Claims25
An ink comprising an effective amount of a dye to color said ink of Formula I, or a salt thereof, and an aqueous medium, said Formula I being the following:
- ##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 -acylamino;
- Y is H, COOH or SO.sub.3 H;
- Z is H, COOH or SO.sub.3 H;
- R is H or C.sub.1-6 -alkyl;
- and
- R.sup.1 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.
An ink comprising an effective amount of a dye of to color said ink Formula II, or a salt thereof, and an aqueous medium, said Formula II being the following:
- ##STR6## wherein Y is H, COOH or SO.sub.3 H;
- and
- Z is H, COOH or SO.sub.3 H;
- provided Y and Z are not both --SO.sub.3 H.
An ink comprising, by wt %:
- (a) from about 0.5% to about 20% dye which, in the free acid state, corresponds to the formula ##STR7## wherein W is COOH,
- X is H or COOH,
- Y is H, COOH, or SO.sub.3 H,
- Z is H, COOH, or SO.sub.3 H, and
- R is H, CH.sub.2 COOH, or CH.sub.2 CH.sub.2 COOH;
- 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 groups,
- (b) 10% to 40% of a water soluble organic solvent for said dye, and
- (c) water.
An ink comprising, by wt %:
- (a) from about 1% to about 10% dye corresponding to the formula ##STR8## wherein W is COOH,
- X is H, or COOH,
- Y and Z are H, COOH, or SO.sub.3 H, and
- R is H, CH.sub.2 COOH, or CH.sub.2 CH.sub.2 COOH;
- 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 groups, and
- (b) water, wherein the ink has a pH from about 7.5 to 9.
An ink comprising, by wt %:
- (a) from about 1% to about 10% dye corresponding to the following formula ##STR9## wherein W is COOH,
- X is H, COOH, or SO.sub.3 H,
- Z and Y are H, COOH, or SO.sub.3 H, and
- R is CH.sub.2 COOH, or CH.sub.2 CH.sub.2 COOH;
- 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 groups,
- (b) about 10% to 40% water-soluble organic solvent, and
- (c) water, wherein the ink has a pH from about 7.5 to 9.
Dependencies are inferred from the claim text.