Ink Set for Ink-Jet Recording

Abstract

An ink set for ink-jet recording is formed from a yellow ink in which C. I. Direct Yellow 132 and C. I. Direct Yellow 86 are employed, a magenta ink in which a specific pyrazolylazopyridine-based (or pyrazolylazopyrazine-based) dye and another specific dye are employed, and a cyan ink in which two specific types of copper phthalocyanine-based dyes are employed.

Description

Claims

1. An ink set for ink-jet recording, comprising: a yellow ink containing a yellow coloring agent, water and a water soluble organic solvent;a magenta ink containing a magenta coloring agent, water and a water soluble organic solvent; anda cyan ink containing a cyan coloring agent, water and a water soluble organic solvent,wherein the yellow ink contains, as the yellow coloring agent, C. I. Direct Yellow 132 and C. I. Direct Yellow 86,wherein the magenta ink contains, as the magenta coloring agent, a magenta dye (1) and at least one dye selected from the group consisting of a magenta dye (2), C. I. Acid Red 52 and C. I. Acid Red 289, the magenta dye (1) being represented by the general formula (1):

2. The ink set for ink-jet recording according to claim 1, wherein the yellow coloring agent of the yellow ink contains C. I. Direct Yellow 132 and C. I. Direct Yellow 86 in a ratio by weight of about 70:30 to about 90:10, wherein the magenta coloring agent of the magenta ink contains the magenta dye (1) and at least one dye selected from the group consisting of the magenta dye (2), C. I. Acid Red 52 and C. I. Acid Red 289 in a ratio by weight of about 70:30 to about 90:10, and wherein the cyan coloring agent of the cyan ink contains the cyan dye (1) and at least one dye selected from the group consisting of the cyan dye (2), the cyan dye (3) and C. I. Direct Blue 86 in a ratio by weight of about 70:30 to about 95:5.

3. The ink set for ink-jet recording according to claim 1, wherein an amount of the yellow coloring agent in the yellow ink is about 1 wt % to about 5 wt % based on the total weight of the yellow ink, an amount of the magenta coloring agent in the magenta ink is about 1 wt % to about 5 wt % based on the total weight of the magenta ink, and an amount of the cyan coloring agent in the cyan ink is about 1 wt % to about 5 wt % based on the total weight of the cyan ink.

4. The ink set for ink-jet recording according to claim 1, wherein, in the general formula (1), R1 is an alkyl group; R2 is a cyano group; R3 is a hydrogen atom or an optionally substituted heterocyclic group; R4 is a hydrogen atom, an optionally substituted heterocyclic group or a substituted aryl group; R5 and R6 are each independently a substituted heterocyclic group or a substituted aryl group; R7 is a hydrogen atom; A1 is a substituted carbon atom; and A2 is an optionally substituted carbon atom.

5. The ink set for ink-jet recording according to claim 4, wherein, in the general formula (1), R1 is a tert-butyl group; R3 is a hydrogen atom or a benzothiazolyl group optionally substituted by a sulfonic acid group or an alkali metal sulfonate group; R4 is a hydrogen atom, a benzothiazolyl group optionally substituted by a sulfonic acid group or an alkali metal sulfonate group, or a trialkylphenyl group substituted by a sulfonic acid group or an alkali metal sulfonate group; R5 and R6 are each independently a monoalkylphenyl or trialkylphenyl group optionally substituted by a sulfonic acid group or an alkali metal sulfonate group, or a benzothiazolyl group substituted by a sulfonic acid group or an alkali metal sulfonate group; A1 is a carbon atom substituted by an alkyl group; and A2 is a carbon atom optionally substituted by a cyano group.

6. The ink set for ink-jet recording according to claim 5, wherein, in the general formula (1), R3 is a hydrogen atom or a benzothiazole-2-yl group optionally substituted by a sulfonic acid group or an alkali metal sulfonate group; R4 is a hydrogen atom, a benzothiazole-2-yl group optionally substituted by a sulfonic acid group or an alkali metal sulfonate group, or a trimethylphenyl group substituted by a sulfonic acid group or an alkali metal sulfonate group; R5 and R6 are each independently a p-octylphenyl group optionally substituted by a sulfonic acid group or an alkali metal sulfonate group, or mesityl group optionally substituted by a sulfonic acid group or an alkali metal sulfonate group, or a benzothiazole-2-yl group substituted by a sulfonic acid group or an alkali metal sulfonate group; and A1 is a carbon atom substituted by a methyl group.

7. The ink set for ink-jet recording according to claim 1, wherein, in the general formula (2), m is 0; R8 is a carboxyl group, a carbamoyl group, a trifluoromethyl group or a sulfamoyl group; R9 and R10 are a hydrogen atom; R11 is a carboxyalkyl group or a phenyl group optionally substituted by a carboxyl group or a sulfamoyl group; R12 is a hydrogen atom; and R13 is a hydrogen atom or an alkyl group.

8. The ink set for ink-jet recording according to claim 1, wherein, in the general formula (3), R14, R15, R16 and R17 are substituents represented by —SO2—Ra, wherein Ra is a substituted or unsubstituted alkyl group, provided that not all the four substituted or unsubstituted alkyl groups Ra in R14, R15, R16 and R17 are completely identical.

9. The ink set for ink-jet recording according to claim 1, wherein, in the general formula (3), k is a number satisfying 0<k<4; l is a number satisfying 0<l<4; p is a number satisfying 0≦p<4; q is a number satisfying 0≦q<4; and the sum of k, l, p and q is 4.

10. The ink set for ink-jet recording according to claim 1, wherein, in the general formula (4), x is a number satisfying 0<x<4; y is a number satisfying 0<y<4; and the sum of x and y is 4.