| http://www.w3.org/ns/prov#value | - In particular, it is especially preferred to pre-polymerize ethylene, propylene or mixtures thereof with one or more alpha-olefins, said mixtures containing up to 20% in moles of alpha-olefin, forming amounts of polymer from about 0.1 g per gram of solid component up to about 1000 g per gram of solid catalyst component.
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