| 摘要 |
Provided are an active-energy-ray-curing inkjet ink which has excellent discharge stability and does not cause a local thermal polymerization reaction, and an image formation method using the same. The present invention pertains to an active-light-curing inkjet ink which contains a photopolymerizable compound, a photoinitiator and a gelling agent, and which undergoes a reversible sol-gel phase transition due to temperature, wherein the photopolymerizable compound contains one or more combinations of: a compound (A) having at least n number (n being an integer of 2 or greater) of (meth)acrylate ester units, represented by the indicated formula, and having a molecular weight in the range of 280-1500; and a compound (B) having n-1 number of (meth)acrylate ester units and a hydroxyl group, represented by the indicated formula, and having a molecular weight in the range of 280-1500 (In the formula, n represents an integer of 2 or more, and R represents n number of hydrocarbon groups which may be branched, are straight-chain-shaped or ring-shaped, and may contain an oxygen atom or a nitrogen atom. n is the same integer and R represents the same structure in both compounds (A and B).) Furthermore, in the one or more combinations of the compound (A) and the compound (B), the amount of the compound (B) contained is 5-15 mass% of the total mass of the compound (A) corresponding to the compound (B), the amount of the gelling agent contained is 0.5-7.0 mass% in relation to the total mass of the ink, and the gelling temperature is 50°C or higher. |
