| http://www.w3.org/ns/prov#value | - Further, desired is a process for preparing the ethylene copolymer rubber in which ethylene, an ??-olefin of 3 or more carbon atoms, a nonconjugated polyene containing one polymerizable carbon-to-carbon double bond in one molecule and a nonconjugated polyene containing two polymerizable carbon-to-carbon double bonds in one molecule can be copolymerized with high activity, and high conversion ratio
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