Transition metal compound, olefin polymerization catalyst component comprising the transition metal compound, olefin polymerization catalyst comprising the olefin polymerization catalyst component, and process for olefin polymerization

An olefin polymerization catalyst component comprising

• a transition metal compound represented by the following formula (I) ##STR9## wherein M is a transition metal of Group IVa, Va or VIa of the periodic table,
• each R.sup.1 is a hydrocarbon group of 1 to 20 carbon atoms,
• each R.sup.2 is an aryl group of 6 to 16 carbon atoms substituted with a halogenated methyl group,
• 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 hydrocarbon group of 1 to 20 carbon atoms, a divalent halogenated hydrocarbon group of 1 to 20 carbon atoms, a divalent silicon-containing group, a divalent germanium-containing group, a divalent tin-containing group, --O--, --CO--, --S--, --SO---, --SO.sub.2 --, --NR.sup.3 --, --P(R.sup.3)--, --P(O)(R.sup.3)--, --BR.sup.3 -- or --AlR.sup.3 -- where R.sup.3 is a hydrogen atom, a halogen atom, a hydrocarbon group of 1 to 20 carbon atoms or a halogenated hydrocarbon group of 1 to 20 carbon atoms.