Azo compound, azo pigment, pigment dispersion, coloring composition, ink for inkjet recording, coloring composition for color filter, color filter, and process for preparing a coloring composition for color filter

1. An azo pigment represented by the general formula (2-1), its tautomer, a salt or hydrate thereof:

wherein G 2 represents a hydrogen atom, an aliphatic group, an aryl group or a heterocyclic group, R 21 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 22 represents a substituent, A 2 ′ represents the following general formulae (A-1) to (A-18), (A-20) to (A-28), and (A-30) to (A-32), m represents an integer of from 0 to 5, n represents an integer of from 1 to 4 and, when n=2, the formula represents a dimer formed through R 21 , R 22 , G 2 , or A 2 ′ and, when n=3, the formula represents a trimer formed through R 21 , R 22 , G 2 , or A 2 ′ and, when n=4, the formula represents a tetramer formed through R 21 , R 22 , G 2 , or A 2 ′ and the general formula (2-1) does not contain an ionic hydrophilic group;

wherein R 51 to R 57 and R 59 in the general formulae (A-1) to (A-18), (A-20) to (A-28) and (A-30) to (A-32) and R 58 in the general formulae (A-1) to (A-17), (A-20) to (A-28), and (A-30) to (A-32) each represents a hydrogen atom or a substituent, and adjacent substituents may be connected to each other to form a 5- or 6-membered ring, R 58 in the general formula (A-18) represents an acyl group, an acyloxy group, a carbamoyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, a cyano group, a nitro group, a dialkylphosphono group, a diarylphosphono group, a diarylphosphinyl group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a sulfonyloxy group, an acylthio group, a sulfamoyl group, a thiocyanato group, a thiocarbonyl group, a halogenated alkyl group, a halogenated alkoxy group, a halogenated aryloxy group, a halogenated alkylamino group, a halogenated alkylthio group, an aryl group substituted with another electron-withdrawing group having a σp value of 0.2 or more, a heterocyclic group, a halogen atom, an azo group, or a selenocyanato group, and * shows the point of attachment to the azo group in the general formula (2-1).

2. The azo pigment, its tautomer, a salt or hydrate thereof according to claim 1 ,

wherein the azo pigment represented by the general formula (2-1) is represented by the following general formula (2′):

wherein G represents a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, an acyl group, an aliphatic oxycarbonyl group, a carbamoyl group, an aliphatic sulfonyl group, or an arylsulfonyl group, R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 2 represents a substituent, A′ represents any of the following general formulae (A-10), (A-14) to (A-16), (A-25), and (A-26), m represents an integer of from 0 to 5, n represents an integer of from 1 to 4 and, when n=2, the formula represents a dimer formed through R 1 , R 2 , A′, or G and, when n=3, the formula represents a trimer formed through R 1 , R 2 , A′, or G and, when n=4, the formula represents a tetramer formed through R 1 , R 2 , A′, or G, and

the general formula (2′) does not contain an ionic hydrophilic group;

wherein R 55 in the general formulae (A-10), (A-14) to (A-16), and (A-25) represents a substituent, R 56 to R 59 in the general formulae (A-10), (A-14) to (A-16), (A-25), and (A-26) each independently represents a hydrogen atom or a substituent, and adjacent R 55 and R 56 , R 57 and R 58 , and R 56 and R 58 may be connected to each other to form a 5- or 6-membered ring, R 55 in the general formula (A-26) represents an aliphatic group, an aryl group or a heterocyclic group, and * shows the point of attachment to the azo group in the general formula (2′).

3. An azo pigment represented by the general formula (3), its tautomer, a salt or hydrate thereof:

wherein R 21 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 22 represents a substituent, R 55 represents a substituent, R 59 represents a hydrogen atom or a substituent, m represents an integer of from 0 to 5, n represents an integer of from 1 to 4, Z represents an electron-withdrawing group having a Hammett σp value of 0.2 or more and, when n=2, the formula represents a dimer formed through R 21 , R 22 , R 55 , R 59 , or Z and, when n=3, the formula represents a trimer formed through R 21 , R 22 , R 55 , R 59 , or Z and, when n=4, the formula represents a tetramer formed through R 21 , R 22 , R 55 , R 59 , or Z, and the general formula (3) does not contain an ionic hydrophilic group.

4. The azo pigment, its tautomer, a salt or hydrate thereof according to claim 1 , wherein the azo pigment represented by the general formula (2-1) is represented by the following general formula (2-2):

wherein G represents a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, an acyl group, an aliphatic oxycarbonyl group, a carbamoyl group, an aliphatic sulfonyl or aryl sulfonyl group, R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 2 represents a substituent, A 2 represents any of the following formulae (A-17), (A-18), (A-20), (A-22) to (A-24), (A-27), (A-28), (A-31), and (A-32), m represents an integer of from 0 to 5, n represents an integer of from 1 to 4 and, when n=2, the formula represents a dimer formed through R 1 , R 2 , or A 2 and, when n=3, the formula represents a trimer formed through R 1 , R 2 , or A 2 and, when n=4, the formula represents a tetramer formed through R 1 , R 2 , or A 2 , and the general formula (2-2) does not contain an ionic hydrophilic group;

wherein in the general formulae (A-17), (A-18), (A-20), (A-22) to (A-24), (A-27), (A-28), (A-31), and (A-32), R 55 to R 59 represent a hydrogen atom or a substituent, adjacent R 55 and R 56 , R 56 and R 57 , R 55 and R 58 , R 56 and R 58 , and R 55 and R 59 may be connected to each other to form a 5- or 6-membered ring, and * shows the point of attachment to the azo group in the general formula (2-2).

5. The azo pigment, its tautomer, a salt or hydrate thereof according to claim 4 , wherein the azo pigment represented by the general formula (2-2) is represented by the following general formula (2-3):

wherein R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 2 represents a substituent, R 56 and R 58 represent a hydrogen atom or a substituent, m represents an integer of from 0 to 5, n represents an integer of from 1 to 4, and, when n=2, the formula represents a dimer formed through R 1 , R 2 , R 56 , or R 58 and, when n=3, the formula represents a trimer formed through R 1 , R 2 , R 56 , or R 58 and, when n=4, the formula represents a tetramer formed through R 1 , R 2 , R 56 , or R 58 , and the general formula (2-3) does not contain an ionic hydrophilic group.

6. A pigment dispersion containing at least one member of the azo pigment, its tautomer, a salt or hydrate thereof according to claim 1 .

7. A coloring composition containing at least one member of the azo pigment, its tautomer, a salt or hydrate thereof according to claim 1 .

8. An ink for inkjet recording, which uses the pigment dispersion according to claim 6 .

9. A coloring composition for color filter, which contains a resin, a photo-polymerization initiator, and an azo pigment represented by the following general formula (1):

wherein G represents a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, an acyl group, an aliphatic oxycarbonyl group, a carbamoyl group, an aliphatic sulfonyl group, or an arylsulfonyl group, R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 2 represents a substituent, A represents an aromatic 5- or 6-membered heterocyclic group, m represents an integer of from 0 to 5, n represents an integer of from 1 to 4 and, when n=2, the formula represents a dimer formed through R 1 , R 2 , A, or G and, when n=3, the formula represents a trimer formed through R 1 , R 2 , A, or G and, when n=4, the formula represents a tetramer formed through R 1 ), R 2 , A, or G, and the general formula (1) does not contain an ionic hydrophilic group.

10. The coloring composition for the color filter according to claim 9 , wherein the azo compound represented by the general formula (1) is represented by the following general formula (2):

wherein G 2 represents a hydrogen atom, an aliphatic group, an aryl group, or a heterocyclic group, R 21 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 22 represents a substituent, A 2 represents the following general formulae (A-1) to (A-32), m and n are the same as are defined with respect to the general formula (1) and, when n=2, the formula represents a dimer formed through R 21 , R 22 , G 2 , or A 2 and, when n=3, the formula represents a trimer formed through R 21 , R 22 , G 2 , or A 2 and, when n=4, the formula represents a tetramer formed through R 21 , R 22 , G 2 , or A 2 , and the general formula (2) does not contain an ionic hydrophilic group;

wherein in the general formulae (A-1) to (A-32), R 51 to R 59 each represents a hydrogen atom or a substituent, adjacent substituents may be connected to each other to form a 5- or 6-membered ring, and * shows the point of attachment to the azo group in the general formula (2).

11. The coloring composition for color filter according to claim 9 , which further contains a polymerizable compound and a solvent.

12. The coloring composition for color filter according to claim 11 , which contains the azo pigment represented by the general formula (1) in a content of from 0.01 to 2 parts by mass per 1 part by mass of the polymerizable compound.

13. The coloring composition for color filter according to claim 11 , wherein the polymerizable compound is a photo-sensitive compound.

14. The coloring composition for color filter according to claim 9 , which further contains one or more members selected from among a surfactant, a silicone series additive, a pigment series additive, a silane series coupling agent, and a titanium series coupling agent.

15. A color filter formed by using the coloring composition for color filter according to claim 9 .

16. The color filter according to claim 15 , which is formed according to photolithography method or inkjet method.

17. A process for preparing the coloring composition for color filter according to claim 14 , which includes a step of obtaining a pigment dispersion by dispersing one or more dispersants selected from among a surfactant, a silicone series additive, a pigment series additive, a silane series coupling agent, and a titanium series coupling agent, and an azo compound represented by the general formula (1) in part of a solvent, and a step of mixing the pigment dispersion with a polymerizable compound and the rest of the solvent.

18. An azo compound represented by the general formula (2-1), its tautomer, a salt or hydrate thereof:

wherein G 2 represents a hydrogen atom, an aliphatic group, an aryl group, or a heterocyclic group, R 21 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 22 represents a substituent, A 2 ′ represents the following general formulae (A-1) to (A-18), (A-20) to (A-28), and (A-30) to (A-32), m represents an integer of from 0 to 5, n represents an integer of from 1 to 4 and, when n=2, the formula represents a dimer formed through R 21 , R 22 , G 2 , or A 2 ′ and, when n=3, the formula represents a trimer formed through R 21 , R 22 , G 2 , or A 2 ′ and, when n=4, the formula represents a tetramer formed through R 21 , R 22 , G 2 , or A 2 ′, and the general formula (2-1) does not contain an ionic hydrophilic group:

wherein R 51 to R 57 and R 59 in the general formulae (A-1) to (A-18), (A-20) to (A-28), and (A-30) to (A-32) and R 58 in the general formulae (A-1) to (A-17), (A-20) to (A-28), and (A-30) to (A-32) each represents a hydrogen atom or a substituent, and adjacent substituents may be connected to each other to form a 5- or 6-membered ring, R 58 in the general formula (A-18) represents an acyl group, an acyloxy group, a carbamoyl group, an alkyloxycarbonyl group, an aryloxycarbonyl group, a cyano group, a nitro group, a dialkylphosphono group, a diarylphosphono group, a diarylphosphinyl group, an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, a sulfonyloxy group, an acylthio group, a sulfamoyl group, a thiocyanato group, a thiocarbonyl group, a halogenated alkyl group, a halogenated alkoxy group, a halogenated aryloxy group, a halogenated alkylamino group, a halogenated alkylthio group, an aryl group substituted with another electron-withdrawing group having a σp value of 0.2 or more, a heterocyclic group, a halogen atom, an azo group, or a selenocyanato group, and * shows the point of attachment to the azo group in the general formula (2-1).

19. The azo compound, its tautomer, a salt or hydrate thereof according to claim 18 , wherein the azo compound represented by the general formula (2-1) is represented by the following general formula (2′):

wherein G represents a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, an acyl group, an aliphatic oxycarbonyl group, a carbamoyl group, an aliphatic sulfonyl group, or an arylsulfonyl group, R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 2 represents a substituent, A′ represents any of the following general formulae (A-10), (A-14) to (A-16), (A-25), and (A-26), m represents an integer of from 0 to 5, n represents an integer of from 1 to 4 and, when n=2, the formula represents a dimer formed through R 1 , R 2 , A′, or G and, when n=3, the formula represents a trimer formed through R 1 , R 2 , A′, or G and, when n=4, the formula represents a tetramer formed through R 1 , R 2 , A 2 ′, or G, and the general formula (2′) does not contain an ionic hydrophilic group;

wherein R 55 in the general formulae (A-10), (A-14) to (A-16), and (A-25) represents a substituent, R 56 to R 59 in the general formulae (A-10), (A-14) to (A-16), (A-25), and (A-26) each independently represents a hydrogen atom or a substituent, and adjacent R 55 and R 56 , R 57 and R 58 , and R 56 and R 58 may be connected to each other to form a 5- or 6-membered ring, R 55 in the general formula (A-26) represents an aliphatic group, an aryl group, or a heterocyclic group, and * shows the point of attachment to the azo group in the general formula (2′).

20. The azo compound, its tautomer, a salt or hydrate thereof according to claim 18 , wherein the azo compound represented by the general formula (2-1) is represented by the following general formula (3):

wherein R 21 , R 22 , R 55 , R 59 , m, and n are the same as those defined with respect to the general formula (2-1), Z represents an electron-withdrawing group having a Hammett σp value of 0.2 or more and, when n=2, the formula represents a dimer formed through R 21 , R 22 , R 55 , R 59 , or Z and, when n=3, the formula represents a trimer formed through R 21 , R 22 , R 55 , R 59 , or Z and, when n=4, the formula represents a tetramer formed through R 21 , R 22 , R 55 , R 59 , or Z, and the general formula (3) does not contain an ionic hydrophilic group.

21. The azo compound, its tautomer, a salt or hydrate thereof according to claim 18 , wherein the azo compound represented by the general formula (2-1) is represented by the following general formula (2-2):

wherein G represents a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, an acyl group, an aliphatic oxycarbonyl group, a carbamoyl group, an aliphatic sulfonyl or aryl sulfonyl group, R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 2 represents a substituent, A 2 represents any of the following formulae (A-17), (A-18), (A-20), (A-22) to (A-24), (A-27), (A-28), (A-31), and (A-32), m represents an integer of from 0 to 5, n represents an integer of from 1 to 4 and, when n=2, the formula represents a dimer formed through R 1 , R 2 , or A 2 and, when n= 3 , the formula represents a trimer formed through R 1 , R 2 , or A 2 and, when n=4, the formula represents a tetramer formed through R 1 , R 2 , or A 2 , and the general formula (2-2) does not contain an ionic hydrophilic group;

wherein in the general formulae (A-17), (A-18), (A-20), (A-22) to (A-24), (A-27), (A-28), (A-31), and (A-32), R 55 to R 59 each represents a hydrogen atom or a substituent, adjacent R 55 and R 56 , R 56 and R 57 , R 55 and R 58 , R 56 and R 58 , and R 55 and R 59 may be connected to each other to form a 5- or 6-membered ring, and * shows the point of attachment to the azo group in the general formula (2-2).

22. The azo compound, its tautomer, a salt or hydrate thereof according to claim 21 , wherein the azo compound represented by the general formula (2-2) is represented by the following general formula (2-3):

wherein R 1 represents an amino group, an aliphatic oxy group, an aliphatic group, an aryl group, or a heterocyclic group, R 2 represents a substituent, R 56 and R 58 each represents a hydrogen atom or a substituent, m represents an integer of from 0 to 5, n represents an integer of from 1 to 4, R 56 and R 58 may be connected to each other to form a 5- or 6-membered ring and, when n=2, the formula represents a dimer formed through R 1 , R 2 , R 56 , or R 58 and, when n=3, the formula represents a trimer formed through R 1 , R 2 , R 56 , or R 58 and, when n=4, the formula represents a tetramer formed through R 1 , R 2 , R 56 , or R 58 , and the general formula (2-3) does not contain an ionic hydrophilic group.