Imaging element containing a polymeric benzylic blocked developer

An imaging element comprising an imaging layer having associated therewith a compound having the following structure:

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• wherein R is hydrogen or methyl and G is selected from the following group:
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• wherein $ denotes the bond to the polymeric backbone and # denotes the bond to W;
• and wherein R5 is hydrogen or substituted or unsubstituted alkyl or aryl;
• W is absent or a bivalent spacer group selected from a substituted or unsubstituted (referring to the following W groups) alkylene, arylene, alkylarylene or alkyleneoxy and wherein W in combination with X, Y, or Z below may form a ring.
• PUG is a residue of removing a hydrogen from one of X, Y, or Z in the following compound:
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• wherein DEV is a releasable developing agent;
• LINK is a linking group;
• and
• X, Y, and Z represent substituents selected independently from the groups hydrogen, alkyl group, cyclopropyl, aryl, arylalkyl, and heterocyclic groups, wherein at least one of X, Y, and Z is an aryl group, and wherein any two or three of X, Y and Z can form a aliphatic, unsaturated or aromatic ring system, and one of X, Y, Z, which may or may not be an aryl group, is attached in the direction of the backbone.