Abstract: This invention relates to a catalyst system for the production of polyolefins comprising: (A) a Group IV B transition metal component represented by one of the two general formulae wherein (C5H5-y-xRx) is a cylopentadienyl ring (JR?z-l-y) is a heteroatom ligand in which J is an element with a coordination number of three from Group V-A or an element with a coordination number of two rom Group VI-A of the Periodic Table of Elements, each Q is independently, hydride, C1—C20 hydrocarbyl radicals, substituted hydrocarbyl radials wherein one or more hydrogen atoms is replaced by an electron withdrawing group, or C1—C20 hydrocarbyl-substituted metalloid radicals wherein the metalloid is selected from the group consisting of germanium and silicon, provided that Q is not a substituted or unsubstituted cyclopentadienyl ring, or both Q together may be an alkylidene, olefin, acetylene or a cyclometallated hydrocarbyl; “y” is 0 or 1; when “y” is 1, T is a covalent bridging group containing a Group IV-A or V-A element

Abstract: Described are certain tetramethylcyclopentadienyl titanium compounds, catalyst systems comprising such compounds and an activator, and to a process using such catalyst systems for the production of polyolefins, particularly ethylene-&agr;-olefin copolymers having a high molecular weight and high level of &agr;-olefin incorporation.

Abstract: A catalyst system comprising a Group 4 transition metal cation having bonded thereto (1) a single cyclopentadienyl ligand or polycyclic derivative thereof, (2) a Group 15 or 16 heteroatom ligand, said single cyclopentadienyl ligand or polycyclic derivative and said heteroatom ligand being covalently bound and bridged to each other, and (3) at least one other ligand selected from the group consisting of hydride, hydrocarbyl, substituted hydrocarbyl, and hydrocarbyl substituted organonometalloid radicals; (b) a compatible non-coordinating anion; (c) a Group 13 element, hydrolyzable Lewis acid compound. The catalyst system is useful for polymerizing olefins, diolefins, cyclic olefins or acetylenically unsaturated monomers, either alone or in combination with each other or with other polymerizable monomers.

Abstract: The invention is generally directed toward a catalyst system useful for polymerizing olefins. The catalyst system of this invention comprises a supported ion-exchange catalyst system.