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PROBLEM TO BE SOLVED : To provide a novel solid material having high functionality, particularly a solid material which can be used as an adsorbent for rare earth elements and the like.
SOLUTION : A solid composition comprises a polymer having a structure represented by the formula (A) in a side chain as a base, and also comprises a specific compound having a functional group such as a phosphate group. The solid composition becomes a solid material having high functionality such as an adsorbent for rare earth elements. (In formula (A), R1s independently represent a hydrogen atom or a methyl group, R2s independently represent a C2-C30 hydrocarbon group, and n is an integer of 2-100, 000).
SELECTED DRAWING : Figure 1
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