Aqueous ink composition, aqueous ink composition for inkjet recording, and inkjet recording method

1. An aqueous ink composition comprising at least:

a sensitizing dye represented by the following Formula (i);

an ethylenically unsaturated bond-containing water-soluble polymerizable compound;

a polymerization initiator; and

water:

wherein, in Formula (i), X represents O, S or NR; n represents an integer of 0 or 1; R represents a hydrogen atom, an alkyl group or an acyl group; each of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 independently represents a hydrogen atom or a monovalent substituent, provided that any neighboring two of R 1 , R 2 , R 3 and R 4 may be bonded to each other to form a ring, and R 5 and R 7 or R 8 , or R 6 and R 7 or R 8 , may be bonded to each other to form an aliphatic ring but do not form an aromatic ring.

2. The aqueous ink composition of claim 1 , wherein at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 in the sensitizing dye represented by Formula (i) is a substituent having a carboxyl group or a salt thereof.

3. The aqueous ink composition of claim 1 , wherein the ethylenically unsaturated bond-containing water-soluble polymerizable compound is at least one selected from the group consisting of an unsaturated carboxylic acid, an unsaturated carboxylate, and a compound having both a poly(alkyleneoxy) group and an ethylenically unsaturated group.

4. The aqueous ink composition of claim 1 , wherein the polymerization initiator is a water-soluble polymerization initiator.

5. The aqueous ink composition of claim 1 , wherein the polymerization initiator is at least one selected from the group consisting of α-aminoketones and acylphosphine oxides.

6. The aqueous ink composition of claim 1 , further comprising a colorant.

7. An inkjet recording method, comprising:

(a) jetting the aqueous ink composition of claim 1 onto a recording medium, and

(b) irradiating the jetted aqueous ink composition with active irradiation to cure the aqueous ink composition.