Patent ID: 6074977
Filing Date: 2000-06-13
Classification: B01J,C08F,Y10S

Abstract:
A catalyst composition comprising in combination:a1) a metal complex corresponding to the formula: Z L MX.sub.p X'.sub.q, wherein:M is a metal of Group 4 of the Periodic Table of the Elements having an oxidation state of +2, +3 or +4, bound in an .eta..sup.5 bonding mode to L;L is a cyclopentadienyl-, indenyl-, tetrahydroindenyl-, fluorenyl-, tetrahydrofluorenyl-, or octahydrofluorenyl-group covalently substituted with at least a divalent moiety, Z, and L further may be substituted with from 1 to 8 substituents independently selected from the group consisting of hydrocarbyl, halo, halohydrocarbyl, hydrocarbyloxy, dihydrocarbylamino, dihydrocarbylphosphino or silyl groups containing up to 20 non-hydrogen atoms, or two such substituents may together form a divalent derivative;Z is a divalent moiety bound to both L and M via .sigma.-bonds, said Z comprising boron, or a member of Group 14 of the Periodic Table of the Elements, and optionally, also comprising nitrogen, phosphorus, sulfur or oxygen;X is an anionic or dianionic ligand group having up to 60 atoms, exclusive of the class of ligands that are cyclic, delocalized, .pi.-bound ligand groups;X' independently each occurrence is a neutral ligating compound, having up to 20 atoms;p is 0, 1 or 2, and is two less than the formal oxidation state of M, with the proviso that when X is a dianionic ligand group, p is 1; andq is 0, 1 or 2;a1') trispentafluorophenylborane; andb) an organoaluminum hydrocarbyloxide compound according to the formula R.sup.1.sub.2 Al (OR.sup.2),wherein R.sup.1 and R.sup.2 independently each occurrence are C.sub.1-30 hydrocarbyl, the molar ratio of a1): b) being torn 1:0.1 to 1:100.