Patent ID: 8273677

Claim:
A process for producing a pre-polymerized catalyst component for addition polymerization, comprising steps of: (1) contacting a transition metal compound represented by following formula [1], or a μ-oxo type dimmer of the transition metal compound, an activation agent, an organometallic compound represented by following formula [2], and an optional organoaluminum compound with one another; thereby forming a primary polymerization catalyst; and (2) pre-polymerizing an olefin in the presence of the primary polymerization catalyst; L 1 a M 1 X 1 b [1] wherein M 1 is a transition metal atom of group 4 in the periodic table; L 1 is a cyclopentadiene-containing anionic group or a hetero atom-containing group, and when two L 1 s exsist, they may be linked to each other, directly or through a linking group containing a carbon, silicon, nitrogen, oxygen, sulfur or phosphorus atom; X 1 is a halogen atom, a hydrocarbyloxy group, or a hydrocarbyl group other than the above cyclopentadiene-containing anionic group; a is a number satisfying 0<a≦3; and b is a number satisfying 0<b≦3; M 2 L 2 m [2] wherein M 2 is a typical metal atom of group 1 or 2 in the periodic table; L 2 is a hydrogen atom, a halogen atom, a hydrocarbyl group, or a hydrocarbyloxy group; and m is a valence of M 2 .