| http://www.w3.org/ns/prov#value | - In addition to derivatives of unsaturated dicarboxylic acids, however, the polymerizable monomer in the compositions according to the invention can also be a compound of general formula (II) in which R4 represents an aryl radical which can be substituted by one or more groups containing double bonds, e.g. styrene or divinyl benzene; these compounds are also particularly preferred as polymerizable
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