| http://www.w3.org/ns/prov#value | - The preferred phosphazo group-containing (meth)acrylate may be shown by the following formula (I). ##STR1## wherein R1 represents, the same or different, a hydrogen atom, a C1-6 alkyl group or a polymerizable group having a (meth)acryloyl group, and at least one of R1 is a polymerizable group having a (meth)acryloyl group.
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