The purpose of the invention is to provide an ink composition having excellent adhesiveness with recording media, little elution (migration) of components in the ink film to the outside after curing, and suppressed odor of the printed material, and an ink jet recording method and printed material using this ink composition, as well as to provide a novel acyl phosphine oxide compound. This ink composition is characterized in containing a monoacyl phosphine oxide compound having a polymerizable functional group in the acyl group and a polymerizable compound.
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