A photopolymerizable composition comprising a polymer having a radical polymerizable group and a unit represented by the following formula (I): ##STR00001## wherein Q.sup.1 represents a cyano group or COX.sup.2; X.sup.1 and X.sup.2 each independently represent --R-- or a halogen atom, R represents a hetero atom; R.sup.a and R.sup.b each independently represent a hydrogen atom, a halogen atom, a cyano group or an organic residual group; X.sup.1 and X.sup.2 may be taken together to form a cyclic structure; R.sup.a and R.sup.b may be taken together to form a cyclic structure; and X.sup.1 and R.sup.a or R.sup.b may be taken together to form a cyclic structure.

 
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