| http://www.w3.org/ns/prov#value | - R2 is, for example, an olefinically unsaturated acyl radical of the formula R3 --CO-- wherein R3 is an olefinically unsaturated copolymerisable radical having from 2 to 24 carbon atoms, preferably from 2 to 8 carbon atoms, especially from 2 to 4 carbon atoms.
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