Patent ID: 7108952

Claim:
A photopolymerizable composition comprising a polymer having a radical polymerizable group in a side chain and a unit represented by the following formula (I): wherein Q 1 represents a cyano group or COX 2 ; X 1 represents a halogen atom or a linking group to which another substituent is bonded to form a hydroxyl group, a substituted oxy group, a mercapto group, a substituted thio group, an amino group, a substituted amino group, a sulfo group, a sulfonate group, a substituted sulfinyl group, a substituted sulfonyl group, a phosphono group, a substituted phosphono group, a phosphonate group, a substituted phosphonate group, a nitro group or a heterocyclic group bonded at the hetero atom thereof; X 2 represents a halogen atom or a linking group to which another substituent is bonded to form a hydroxyl group, a substituted oxy group, a mercapto group, a substituted thio group, an amino group, a substituted amino group or a heterocyclic group bonded at the hetero atom thereof; R a and R b each independently represent a hydrogen atom; X 1 and X 2 may be taken together to form a cyclic structure.