The object of the present invention is to provide an ink composition that is excellent in terms of adhesion to a recording medium, for which there is little leaching out (migration) of a component in the cured ink film, and that gives a printed material with suppressed odor, and an inkjet recording method and a printed material employing the ink composition, and also to provide a novel acylphosphine oxide compound.;The ink composition of the present invention contains an acylphosphine oxide compound having an acyl group comprising a polymerizable functional group, and a polymerizable compound.
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