Ink composition, inkjet recording ink, and inkjet recording method

1. An ink composition comprising a first color material and a second color material,

wherein the first color material is a compound represented by the following Formula (A-I), and the second color material is a compound represented by the following Formula (B-V):

wherein, in Formula (A-I), R 4 's represent a substituent,

R 5 's represent —OR 6 or —NHR 7 , and R 6 and R 7 represent a hydrogen atom or a substituent,

X 3 represents a divalent linking group,

n0 is 0 or 1,

Ar 3 's represent a divalent heterocyclic group, and

Ar 4 's represent an alkyl group, an aryl group, or a triazine group:

wherein, in Formula (B-V), R 13 's each independently represent a hydrogen atom or a substituent,

R 14 's each independently represent —OR 16 , —NHR 17 or a cyano group, and R 16 and R 17 represent a hydrogen atom or a substituent,

X 1 represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted triazine group,

n6 is 0 or 1,

Ar 1 's each independently represent a divalent heterocyclic group, and

Ar 2 's each independently represent a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, or a triazine group,

wherein the content of the first color material in the ink composition is 0.1 or more and 10.0 or less by mass ratio (mass of the first color material/mass of the second color material) relative to the content of the second color material.

2. The ink composition according to claim 1 ,

wherein the compound represented by Formula (A-I) is a compound represented by the following Formula (A-II):

wherein, in Formula (A-II), R 4 's represents a substituent,

R 5 's represent —OR 6 or —NHR 7 , and R 6 and R 7 represent a hydrogen atom or a substituent,

X 3 represents a divalent linking group,

n0 is 0 or 1,

Ar 3 's represent a divalent heterocyclic group,

A 1 's represent an ionic hydrophilic group, and

n1's represent 0 to 2.

3. The ink composition according to claim 1 ,

wherein the compound represented by Formula (A-I) is a compound represented by the following Formula (A-III):

wherein, in Formula (A-III), R 20 represents an alkylene group, —S—, or a linking group formed by a combination thereof,

R 21 's represent an ionic hydrophilic group,

R 11 's represent an alkyl group, and

R 12 's represent an amino group.

4. The ink composition according to claim 1 ,

wherein the compound represented by Formula (B-V) is a compound represented by the following Formula (B-VI):

wherein, in Formula (B-VI), R 13 's each independently represent a hydrogen atom or a substituent,

R 14 's each independently represent —OR 16 , —NHR 17 or a cyano group, and R 16 and R 17 represent a hydrogen atom or a substituent,

X 1 represents a substituted or unsubstituted aryl group, or a substituted or unsubstituted triazine group,

n0 is 0 or 1,

Ar 1 's each independently represent a divalent heterocyclic group,

Ar 4 's each independently represent an ionic hydrophilic group, and

n7's represents 0 to 2.

5. The ink composition according to any one of claim 1 ,

wherein the compound represented by Formula (B-V) is a compound represented by the following Formula (B-VII):

wherein, in Formula (B-VII), R 15 represents —OM,

R 20 's represent —CO 2 M, and M represents a hydrogen atom or a monovalent counter cation,

R 21 's represent a substituted or unsubstituted alkyl group,

R 13 's each independently represent a hydrogen atom or a substituent,

R 18 's represent a substituted or unsubstituted amino group, and

R 19 's represent a cyano group.

6. The ink composition according to claim 1 ,

wherein the content of the first color material is 0.1% by mass to 8% by mass based on the total mass of the ink composition.

7. The ink composition according to claim 1 ,

wherein the content of the second color material is 0.1% by mass to 8% by mass based on the total mass of the ink composition.

8. The ink composition according to claim 1 , further comprising:

at least one of a water-soluble organic solvent, a urea-based compound, a preservative, a nonionic surfactant and a metal chelator.

9. A cartridge ink for an inkjet printer, which fills a chamber in a cartridge for a printer,

wherein the ink contains the ink composition according to claim 1 .

10. An inkjet recording method using the cartridge ink for an inkjet printer according to claim 9 .

11. An inkjet printer using the cartridge ink for a printer according to claim 9 .