Ink composition and image forming method
An ink composition including: (Component A) a polymerizable compound represented by following Formula (1); (Component B) a monofunctional polymerizable compound having a (meth)acrylamide structure; (Component C) a photopolymerization initiator; (Component D) a colorant; and (Component E) water, wherein in Formula (1), Z represents a polyol residue formed by removing n hydrogen atoms from hydroxyl groups of a trihydric to hexahydric polyol, R 1 represents a hydrogen atom or a methyl group, and n represents an integer of from 3 to 6.
1. An ink composition comprising:
a polymerizable compound represented by the following Formula (1);
a monofunctional polymerizable compound having a (meth)acrylamide structure;
a photopolymerization initiator;
a colorant; and
water,
wherein, in Formula (1), Z represents a polyol residue formed by removing n hydrogen atoms from hydroxyl groups of a trihydric to hexahydric polyol, R 1 represents a hydrogen atom or a methyl group, and n represents an integer of from 3 to 6.
2. The ink composition according to claim 1 , wherein Z of Formula (1) represents a polyol residue formed by removing n hydrogen atoms from hydroxyl groups of glycerin, erythritol, xylitol, mannitol, sorbitol, pentaerythritol or dipentaerythritol.
3. The ink composition according to claim 1 , wherein the monofunctional polymerizable compound having a (meth)acrylamide structure is represented by the following Formula (2):
wherein, in Formula (2), R 11 represents a hydrogen atom or a methyl group, R 12 represents an alkylene group, and R 13 represents an acyl group, a hydroxyl group, a tertiary amino group, a quaternary ammonium group or a sulfo group.
4. The ink composition according to claim 1 , wherein a mass ratio of the polymerizable compound represented by Formula (1) and the monofunctional polymerizable compound having a (meth)acrylamide structure (polymerizable compound represented by Formula (1): monofunctional polymerizable compound having a (meth)acrylamide structure) is in a range of from 10:90 to 70:30.
5. The ink composition according to claim 1 , wherein a mass ratio of the polymerizable compound represented by Formula (1) and the monofunctional polymerizable compound having a (meth)acrylamide structure (polymerizable compound represented by Formula (1): monofunctional polymerizable compound having a (meth)acrylamide structure) is in a range of from 10:90 to 40:70.
6. The ink composition according to claim 1 , wherein an amount of the polymerizable compound represented by Formula (1) is from 1 to 14% by mass relative to a total amount of the ink composition.
7. The ink composition according to claim 1 , wherein an amount of the monofunctional polymerizable compound having a (meth)acrylamide structure is from 6 to 35% by mass relative to a total amount of the ink composition.
8. The ink composition according to claim 1 , wherein the polymerizable compound represented by Formula (1) is one selected from the group consisting of the following Polymerizable Compounds 1 to 7
9. The ink composition according to claim 1 , wherein the monofunctional polymerizable compound having a (meth)acrylamide structure is one selected from the group consisting of the following compounds (B-1) to (B-10)
10. The ink composition according to claim 1 , wherein the monofunctional polymerizable compound having a (meth)acrylamide structure is hydroxyethyl acrylamide.
11. The ink composition according to claim 1 , wherein the photopolymerization initiator is a water-soluble photopolymerization initiator.
12. A method of inkjet recording using the ink composition according to claim 1 .
13. An image forming method comprising:
applying the ink composition according to claim 1 onto a recording medium; and
irradiating the applied ink composition with actinic energy rays.
14. The image forming method according to claim 13 , wherein the applying of the ink composition comprises applying the ink composition by inkjetting.