Active energy ray-curable inkjet ink composition
An ink composition which is used for active energy ray-curable inkjet printing, has excellent curability or adhesiveness to multiple base materials while having low viscosity, and exhibits excellent non-yellowing properties of the printed matter is provided. The composition comprises a polymerizable monomer (A) and photopolymerization initiators (B), the polymerizable monomer comprising 2-(2-vinyloxyethoxy)ethyl acrylate (A-1), and the photopolymerization initiators comprising oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) (B-1) and other initiator (B-2).
1. An active energy ray-curable inkjet ink composition, comprising:
a polymerizable monomer; and
at least two photopolymerization initiators,
wherein:
the polymerizable monomer comprises 2-(2-vinyloxyethoxy)ethyl acrylate;
the at least two photopolymerization initiators comprise oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) and 2,4,6-trimethylbenzoyldiphenylphosphine oxide; and
oligo(2-hydroxy-2-methyl-1-(4-(1-methylvinyl)phenyl)propanone) is present in an amount of 20 to 80% by weight relative to a total amount of photopolymerization initiators.
2. The active energy ray-curable inkjet ink composition according to claim 1 , wherein 2-(2-vinyloxyethoxy)ethyl acrylate is present in an amount of 33.4% by weight or more relative to a total amount of the polymerizable monomer.
3. The active energy ray-curable inkjet ink composition according to claim 1 , wherein the polymerizable monomer further comprises at least one monomer selected from the group consisting of dipropylene glycol diacrylate, 1,9-nonanediol diacrylate and 1,10-decanediol diacrylate.
4. The active energy ray-curable inkjet ink composition according to claim 3 , wherein a total amount of dipropylene glycol diacrylate, 1,9-nonanediol diacrylate and 1,10-decanediol diacrylate is 20% by weight or more relative to a total amount of the polymerizable monomers.
5. The active energy ray-curable inkjet ink composition according to claim 1 , wherein the ink composition is substantially free of colorant.