Ink, ink-jet recording method using the same, and photopolymerization initiator Abstract An ink for ink-jet recording contains a coloring agent, a polymerizable oligomer, water, and a photopolymerization initiator having a solubility in water of 3 percent by weight or more. Another ink for ink-jet recording contains a coloring agent, a polymerizable oligomer having at least two acryloyl groups and a solubility in water of 10 percent by weight or more, a photopolymerization initiator, and water. The specified polymerizable oligomer or photopolymerization initiator reduces bleeding of the ink on recording media. Claims What is claimed is: 1. A photopolymerization initiator represented by the following general formula (1): ##STR27## wherein n is an integer of 1 or more, m is an integer of 1 or more, and the sum of n and m is in a range of 2 to 8. 2. A photopolymerization process comprising the step of: irradiating a photopolymerization initiator according to claim 1 and a polymerizable oligomer. 3....