| http://www.w3.org/ns/prov#value | - Preferably, olefins of the formula Ra --CH???CH--Rb are homopolymerized or copolymerized, where Ra and Rb are identical or different and are a hydrogen atom or a hydrocarbon radical having from 1 to 20 carbon atoms, in particular from 1 to 10 carbon atoms, or Ra and Rb together with the atoms connecting them form one or more rings.
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