Active energy ray-curable ink and image recording method
An active energy ray-curable ink including a radical polymerizable monomer, a radical polymerization initiator, a pigment, a pigment dispersing resin, an organic onium salt, and a radical polymerization inhibitor, wherein the content of the radical polymerization inhibitor is 0.05% to 5.0% by mass of the total amount of the active energy ray-curable ink and an image recording method.
1. An active energy ray-curable ink comprising:
a radical polymerizable monomer;
a radical polymerization initiator;
a pigment;
a pigment dispersing resin;
an organic onium salt; and
a radical polymerization inhibitor,
wherein a content of the radical polymerization inhibitor is 0.05% to 5.0% by mass of a total amount of the active energy ray-curable ink, and the organic onium salt has a ClogP of 3.5 or more.
2. The active energy ray-curable ink according to claim 1 ,
wherein a content of the radical polymerizable monomer is 80% by mass or more of a total amount of a polymerizable compound included in the active energy ray-curable ink.
3. The active energy ray-curable ink according to claim 1 ,
wherein a content of the organic onium salt is 0.01% to 8.0% by mass of the total amount of the active energy ray-curable ink.
4. The active energy ray-curable ink according to claim 1 ,
wherein the content of the organic onium salt is 0.05% to 8.0% by mass of the total amount of the active energy ray-curable ink.
5. The active energy ray-curable ink according to claim 1 ,
wherein a mass ratio of the content of the organic onium salt to the content of the radical polymerization inhibitor is 0.10 to 150.
6. The active energy ray-curable ink according to claim 1 ,
wherein the radical polymerization inhibitor includes at least one selected from the group consisting of a nitroso aluminum compound, a quinone compound, and a nitroxyl radical compound.
7. The active energy ray-curable ink according to claim 1 ,
wherein a mass ratio of the content of the organic onium salt to a content of the pigment dispersing resin is 0.02 or more.
8. An image recording method comprising:
applying the active energy ray-curable ink according to claim 1 to a recording medium to form an ink film, by ejecting the active energy ray-curable ink from an ink jet head including a liquid repelling film disposed on a nozzle surface of the ink jet head; and
irradiating the ink film with an active energy ray.
9. The image recording method according to claim 8 ,
wherein the irradiation includes irradiating the ink film with the active energy ray in an atmosphere having an oxygen concentration of 5% by volume or less.
10. An active energy ray-curable ink comprising:
a radical polymerizable monomer;
a radical polymerization initiator;
a pigment;
a pigment dispersing resin;
an organic onium salt; and
a radical polymerization inhibitor,
wherein a content of the radical polymerization inhibitor is 0.05% to 5.0% by mass of a total amount of the active energy ray-curable ink,
a mass ratio of the content of the organic onium salt to the content of the radical polymerization inhibitor is 0.10 to 150,
and the organic onium salt has a ClogP of 3.5 or more.
11. An active energy ray-curable ink comprising:
a radical polymerizable monomer;
a radical polymerization initiator;
a pigment;
a pigment dispersing resin;
an organic onium salt; and
a radical polymerization inhibitor,
wherein a content of the radical polymerization inhibitor is 0.05% to 5.0% by mass of a total amount of the active energy ray-curable ink, and the organic onium salt has a ClogP of 4 or more.