Active energy ray-curable inkjet ink composition
Provided is an active energy ray-curable inkjet ink comprising a pigment and polymerizable monomers that is superior in nozzle ejection stability, adhesiveness to recording medium and storage stability, wherein the polymerizable monomers comprise N-acryloyloxyethyl hexahydrophthalimide.
1. An inkjet ink, comprising:
polymerizable monomers which comprise N-acryloyloxyethyl hexahydrophthalimide;
wherein
the inkjet ink is non-aqueous,
a content of the N-acryloyloxyethyl hexahydrophthalimide is from 1 to 30% by weight with respect to a total weight of the polymerizable monomers, and
a viscosity of the inkjet ink is from 5 to 50 mPa·s at 25° C.
2. The inkjet ink of claim 1 , wherein the polymerizable monomers further comprise N-vinyl-2-caprolactam in an amount of from 5 to 30% by weight with respect to the total weight of the polymerizable monomers.
3. The inkjet ink of claim 1 , which has an electrical conductivity of from 0.5 to 10 μS/cm.
4. The inkjet ink of claim 1 , wherein the polymerizable monomers further comprise an acrylate monomer other than N-acryloyloxyethyl hexahydrophthalimide.
5. The inkjet ink of claim 1 , further comprising a photopolymerization initiator.
6. The inkjet ink of claim 5 , wherein an amount of the photopolymerization initiator is from 2 to 20% by weight with respect to the total weight of the ink.
7. The inkjet ink of claim 1 , further comprising a colorant component selected from the group consisting of a dye, a pigment, and combinations thereof.
8. The inkjet ink of claim 7 , wherein the colorant component comprises the pigment.
9. The inkjet ink of claim 1 , wherein the polymerizable monomers further comprise 2-phenoxyethyl acrylate in an amount of from 30 to 90% by weight with respect to the total weight of the polymerizable monomers.
10. The inkjet ink of claim 9 , further comprising a photopolymerization initiator.
11. The inkjet ink of claim 10 , wherein an amount of the photopolymerization initiator is from 2 to 20% by weight with respect to the total weight of the ink.
12. The inkjet ink of claim 11 , wherein the polymerizable monomers further comprise N-vinyl-2-caprolactam in an amount of from 5 to 30% by weight with respect to the total weight of the polymerizable monomers.
13. The inkjet ink of claim 12 , further comprising a colorant component selected from the group consisting of a dye, a pigment, and combinations thereof.
14. The inkjet ink of claim 13 , wherein the colorant component comprises the pigment.
15. The inkjet ink of claim 14 , wherein the pigment is an organic pigment.
16. The inkjet ink of claim 14 , wherein the pigment is an inorganic pigment.
17. The inkjet ink of claim 14 , wherein the pigment comprises an organic pigment and an inorganic pigment.
18. A printing, which is obtained by a process comprising forming an image on a substrate with the inkjet ink of claim 1 , and curing the inkjet ink of the image by irradiation with an active energy ray.