WE CLAIM:
1. A pigment composition comprising:
at least one pigment selected from the group consisting of a perinone-based pigment and a perylene-based pigment;
water;
a resin having a constitutional unit represented by Formula 1; and
at least one compound selected from the group consisting of a phthalimide compound having a carboxyalkyl group and a naphthalimide compound having a carboxyalkyl group,
in Formula 1, R1 represents a hydrogen atom or a methyl group, L2 represents -C(=0)0-, -OC(=0)-, or -C(=0)NR2-, R2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R3 represents an alkyl group having 6 or more carbon atoms.
2. The pigment composition according to claim 1,
wherein the pigment includes at least one pigment selected from the group consisting of C. I. Pigment Orange 43, C. I. Pigment Red 194, C. I. Pigment Red 123, C. I. Pigment Red 149, C. I. Pigment Red 178, C. I. Pigment Red 179, C. I. Pigment Red 189, C. I. Pigment Red 190, and C. I. Pigment Black 31.
3. The pigment composition according to claim 1 or 2,
wherein the pigment includes a perinone-based pigment.
4. The pigment composition according to any one of claims 1 to 3,
wherein the pigment includes C. I. Pigment Orange 43.
5. The pigment composition according to any one of claims 1 to 4,
wherein the carboxyalkyl group in the at least one compound selected from the group consisting of a phthalimide compound having a carboxyalkyl group and a naphthalimide compound having a carboxyalkyl group is a carboxymethyl group or a carboxyethyl group.

6. The pigment composition according to any one of claims 1 to 5,
wherein the at least one compound selected from the group consisting of a phthalimide compound having a carboxyalkyl group and a naphthalimide compound having a carboxyalkyl group is a naphthalimide compound having a carboxyalkyl group.
7. The pigment composition according to any one of claims 1 to 6,
wherein the resin having a constitutional unit represented by Formula 1 is an acrylic resin.
8. The pigment composition according to any one of claims 1 to 7,
wherein R3 is an alkyl group having 8 to 22 carbon atoms.
9. The pigment composition according to any one of claims 1 to 8,
wherein the resin having a constitutional unit represented by Formula 1 further has a constitutional unit having an aromatic ring.
10. The pigment composition according to any one of claims 1 to 9,
wherein the resin having a constitutional unit represented by Formula 1 further has a constitutional unit having an acidic group.
11. An aqueous ink composition including the pigment composition according to any one of claims 1 to 10.
12. A method for producing a pigment composition comprising:
a step of mixing at least one pigment selected from the group consisting of a perinone-based pigment and a perylene-based pigment, water, a resin having a constitutional unit represented by Formula 1, and at least one compound selected from the group consisting of a phthalimide compound having a carboxyalkyl group and a naphthalimide compound having a carboxyalkyl group,

in Formula 1, R1 represents a hydrogen atom or a methyl group, L2 represents -C(=0)0-, -OC(=0)-, or -C(=0)NR2- and R2 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R3 represents an alkyl group having 6 or more carbon atoms.
13. The method for producing a pigment composition according to claim 12, the method comprising:
a step of performing salt-milling treatment on at least one pigment selected from the group consisting of a perinone-based pigment and a perylene-based pigment, before the mixing step.