Patent ID: 6462154
Filing Date: 2002-10-08
Classification: C08F

Abstract:
A process for preparing an olefin polymer which comprises the step of polymerizing at least one olefin monomer in the presence of a catalyst system consisting essentially of (A) a transition metal complex compound having only one cyclopentadienyl group represented by the general formula (I) wherein M is a metallic element in group 4 of the periodic table; L is a cyclopentadienyl group or cyclopentadienyl group substituted by one or more alkyl groups; A is a divalent group containing an element selected from the group consisting of elements in the groups 13, 14, 15 and 16 of the periodic table; B is a bonding group containing an element selected from the group consisting of elements in the groups 14, 15 and 16 of the periodic table, and A and B may optionally form a ring together; X is a halogen atom; and n is an integer of 0 to 4 which varies with the valence of M, and when n is 2 or more, a plurality of Xs may be the same or different, (B) at least one member selected from the group consisting of a Lewis acid and an ionic compound capable of reacting with the transition metal complex compound of the component (A) to form an ionic complex, and (C) an aluminum compound represented by Formula IV:R6rAlQ3-râ€ƒâ€ƒ(IV) wherein R6 is an alkyl group having 1 to 12 carbon atoms; Q is a hydrogen atom, an alkoxy group having 1 to 20 carbon atoms or a halogen atom; and r is an integer of 1 to 3, and wherein the aluminum compound has at least one alkyl group of 3 or more carbon atoms, the component (C) being used in an amount such that an atomic ratio of aluminum from component (C)/group IV metallic element of component (A) ranges from 200 to 2500.