Patent ID: 11866593
Assignee: TOYOCOLOR CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC C

Claim 5:
6. 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,
the content of a monofunctional monomer in the ultraviolet curable inkjet ink is 25% by mass or less, and
the content of a trifunctional or greater monomer in the ultraviolet curable inkjet ink is 2% 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.