| http://www.w3.org/ns/prov#value | - These components, used to prepare the final catalysts by mixing them with organometallic compounds of metals belonging to Groups I, II and III of the Mendelyeev Periodic Table, provide catalysts which are particularly active in the polymerization of ethylene, alpha-olefins having at least three carbon atoms, and mixtures of ethylene with alpha-olefins and/or with diolefins or multiolefins.
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