| http://www.w3.org/ns/prov#value | - In another embodiment, R3 is an olefinically unsaturated acyl group of formula R8???CO???, in which R8 is an olefinically unsaturated copolymerizable group having from 2 to 24 carbon atoms, preferably from 2 to 8 carbon atoms, especially preferably from 2 to 4 carbon atoms.
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