| http://www.w3.org/ns/prov#value | - A crosslinkable polymer according to claim 16, which comprises units of the formula VII, in which:R3 is hydrogen or a CH3 or C2 H5 group, R is a C1 -C3 alkylene bridge, m is 0, R1 is a radical of a heterocyclic compound, Y is a C7 -C12 aromatic radical, and Z is a C2 -C4 alkylene bridge. 20.
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