CPC C09D 11/101 (2013.01) [C09D 11/326 (2013.01); C09D 11/38 (2013.01)] | 9 Claims |
1. An ultraviolet curable inkjet ink comprising a colorant, a polymerizable monomer, and a photopolymerization initiator, wherein
the polymerizable monomer comprises a compound represented by the following General formula (A),
the photopolymerization initiator comprises
an ethoxyphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, and
an acylphosphine oxide photopolymerization initiator different than the ethoxyphenyl(2,4,6-trimethylbenzoyl)phosphine oxide,
the ratio of the content of the compound represented by the General formula (A) and the content of the ethoxyphenyl(2,4,6-trimethylbenzoyl)phosphine oxide is 2:1 to 8.5:1 by mass ratio,
the ratio of the content of the ethoxyphenyl(2,4,6-trimethylbenzoyl)phosphine oxide and the content of the acylphosphine oxide photopolymerization initiator is 0.5:1 to 3:1 by mass ratio, and
the content of a monofunctional monomer in the ultraviolet curable inkjet ink is 25% by mass or less,
CH2═CH—CO—(O—CH2CH2)n—O—R General formula (A):
wherein in General formula (A), R represents an acryloyl group or a vinyl group, and n represents an integer from 2 to 10,
wherein the acylphosphine oxide photopolymerization initiator different than the ethoxyphenyl(2,4,6-trimethylbenzoyl)phosphine oxide comprises bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, and
wherein the content of the compound represented by the General formula (A) in the ultraviolet curable inkjet ink is 8 to 20% by mass.
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