| http://www.w3.org/ns/prov#value | - In either preliminary polymerization treatment, the straight chain alpha-olefin having 2 to 5 carbon atoms is used in an amount of 0.1 to 300 g, preferably 1 to 100 g, particularly preferably 1 to 50 g, per g of the solid part of the polymerization catalyst component (X), and 3-methyl-1-butene is used in an amount of 0.1 to 100 g, preferably 1 to 50 g, particularly preferably 2 to 50 g, per g of t
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