Patent ID: 6451938
Filing Date: 2002-09-17
Classification: C08F,Y10S

Abstract:
A polymerization catalyst system comprising a catalytic complex formed by activating a transition metal compound; wherein the transition metal compound is represented by the formula:{[Lâ€²]q}m{T}{[JRy]p}nM[A]2 wherein:a) M is a Group 3, 4, 5, 6, 7, 8, 9, or 10 metal; b) Lâ€² is a substituted or unsubstituted stabilizing ligand, at least one Lâ€² is a heterocyclic fused ring cyclopentadienide ligand having a C5 cyclopentadienide moiety and one or more fused-ring heterocycles in which at least one heteroatom is selected from Group-13, -15, or -16 elements; c) J is a group 15 or 16 heteroatom having a formal negative charge bonded to M; d) R is a substituted bonded to J; e) y has a value of zero, 1 or 2 as necessary to complete the valency of J; f) T is an optional bridging group that Lâ€² and J; g) A is a monatomic or polyatomic ligand, other than a cyclopentadienide-containing ligand, which bears a formal negative charge of one and can be the same as or different from any other A; h) q and p are integers representing the formal charge on the substituted or unsubstituted stabilizing ligand Lâ€² and JRy, respectively; and i) m is an integer equal to 1 or 2 and n is an integer equal to 0, 1, or 2 and are chosen such that (MÃ—q)+(nÃ—p)=(sâˆ’2), where s is the Group number of M.