Propylene homopolymer and propylene copolymer prepared using novel bridged indenyl-containing metallocene

A propylene copolymer containing not less than 50% by mol of propylene unit, which is obtained by copolymerizing propylene and an .alpha.-olefin selected from the group consisting of ethylene and .alpha.-olefins of 4 to 20 carbon atoms in the presence of an olefin polymerization catalyst comprising:

• (A) a transition metal compound catalyst component represented by the following formula (I):
• ##STR23## wherein M is zirconium,
• R.sup.1 is an alkyl group of 2 to 4 carbon atoms,
• R.sup.2 is an aryl group selected from the group consisting of phenyl, naphthyl, anthracenyl and phenanthryl, X.sup.1 and X.sup.2 are each a hydrogen atom, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms, a halogenated hydrocarbon group of 1 to 20 carbon atoms, an oxygen-containing group or a sulfur-containing group;
• and
• Y is a divalent silicon-containing group selected from the group consisting of alkylsilylene, alkylarylsilylene and arylsilylene;
• and
• (B) at least one compound selected from the group consisting of
• (B-1) an organoaluminum oxy-compound, and
• (B-2) a compound which reacts with the transition metal compound to form an ion pair.