Recording medium

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PROBLEM TO BE SOLVED : To provide a recorded medium which allows recording of images excellent in scratch resistance and color development in recording with an inkjet recording printer or plotter using a pigment ink.SOLUTION : A recorded medium comprises a polymer with a benzimidazolinone backbone such as a polymer including a constitutional unit derived from a compound represented by the general formula (1) in the figure. (Rand Rare each a hydrogen atom, a C1-4 alkyl group, a phenylalkyl group or an aminoalkyl group; Ris a hydrogen atom or a methyl group; and X is a linking group.)