Patent ID: 6812303
Filing Date: 2004-11-02
Classification: C08F

Abstract:
An olefin polymerization catalyst comprising:(A) a transition metal compound comprising titanium having &eegr;-bonded thereto a cyclic anionic ligand; (B) a mixture of: (B-1) an activator compound which is present in an amount 0.5 to 10 times the molar amount of said transition metal compound (A), and (B-2) an organometal compound which is present in an amount 0.05 to 20 times the molar amount of said activator compound (B-1), said activator compound (B-1) being capable of reacting with said transition metal compound (A) to form a metal complex having a catalytic activity; said organometal compound (B-2) being represented by the following formula (1): MRnXm-nâ€ƒâ€ƒ(1) wherein M represents an element selected from the group consisting of elements of Groups 1 to 15 of the Periodic Table, R each occurrence independently represents a C1-C12 linear, branched or cyclic alkyl group or a C6-C20 aryl group; X each occurrence independently represents a halide, a hydride or a C1-C10 alkoxide group; and m represents a formal oxidation state of M, and n is an integer of from 1 to m, wherein m is as defined above, wherein the molar ratio of R group of said organometal compound (B-2) to said activator compound (B-1) is from 0.5 to 2; (C) a solid component having no hydroxyl group; and optionally (D) an organoaluminum compound, said catalyst being obtained by contacting said components (A) to (C) and optionally said component (D); wherein said transition metal compound (A) is represented by the following formula (6): wherein: M represents titanium; X represents a neutral C4-C30 conjugated diene; R3 each occurrence independently represents a substituent selected from the group consisting of hydrogen, a C1-C10 hydrocarbon group, a silyl group and combinations thereof, with the proviso that, when said R3 substituent is a C1-C10 hydrocarbon group or a silyl group, two adjacent R3 substituents are optionally bonded together to form a divalent group, thereby forming a ring in cooperation with a bond between two carbon atoms on the cyclopentadienyl ring which are bonded to said two adjacent R3 substituents, respectively; R3â€² represents a C1-C10 hydrocarbyl group; R3â€³ each occurrence independently represents hydrogen or a C1-C10 hydrocarbyl group; E each occurrence independently represents silicon or carbon; and m is 2; wherein said activator compound (B-1) is represented by the following formula (9): [L-H]+[BQ3Qâ€²]âˆ’â€ƒâ€ƒ(9) wherein: [L-H]+ represents a proton-donating BrÃ¸nsted acid wherein L represents a neutral Lewis base containing carbon, nitrogen, phosphorus or sulfur; and [BQ3Qâ€²]âˆ’ represents a noncoordinating, compatible anion, wherein Q each occurrence independently represents a C6-C20 aryl group which is unsubstituted or substituted with at least one substituent selected from the group consisting of a C1-C12 hydrocarbon group and a halogen, and Qâ€² represents a C6-C20 aryl group substituted with a hydroxyl group.