| 摘要 |
PROBLEM TO BE SOLVED: To provide a UV-curable inkjet ink composition that gives excellent durability to an inkjet head and has excellent ejection reliability.SOLUTION: The UV-curable inkjet ink composition comprises a monomer and a photopolymerization initiator. The composition contains: a monomer satisfying a condition represented by |&sgr;-10.5|≥1.0 with regard to an SP value (&sgr;) calculated by Small's expression, by 20 mass% or more with respect to the total mass of the ink composition; a monomer satisfying a condition represented by 0.5≤|&sgr;-10.5|<1.0 with regard to the SP value (&sgr;), by 20 mass% or more with respect to the total mass of the ink composition; and a monomer, if necessary, satisfying a condition represented by |&sgr;-10.5|<0.5 with regard to the SP value (&sgr;) by 20 mass% or less with respect to the total mass of the ink composition. The ink composition is to be ejected through an inkjet head using an epoxy-based adhesive. |
