US 5,153,157 AGranted

Catalyst system of enhanced productivity

AssigneeExxon Chemical Patents Inc.

InventorsGregory G. Hlatky, Howard W. Turner

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Abstract

This invention relates to catalyst systems, and a method for using such system, for the enhanced production of homo and copolymer products of olefin, diolefin and/or acetylenically unsaturated monomers. This invention catalyst system comprises a Group III-A element compound for improving the productivity of an olefin polymerization catalyst which is the reaction product of a metallocene of a Group IV-B transition metal and an ionic activator compound comprising a cation capable of donating a proton or which will irreversibly react with at least one ligand contained in the Group IV-B metal compound and an anion which is bulky, labile and noncoordinateable with the Group IV transition metal cation produced upon reaction of the metallocene and activator compound to form the catalyst component of the catalyst system.

Claims12

Dependent claims

A catalyst system comprising

(a) a reaction product of
(i) a bis(cyclopentadienyl) Group IV B metal compound;
and
(ii) a activator compound comprising
(1) a cation, which will irreversibly react with at least one ligand contained in said Group IV B metal compound, and
(2) a labile, bulky anion which is a single coordination complex having a plurality of lipophilic radicals covalently coordinated to and shielding a central charge-bearing metal or metalloid atom, or an anion comprising a plurality of boron atoms the bulk of said anion being such that upon reaction of the cation with a ligand of said bis(cyclopentadienyl) Group IV B metal compound whereby a Group IV-B metal cation is formed said anion is sterically hindered from covalently coordinating o the Group IV-B metal cation, and the lability of said anion being such that it is displaceable from said group IV-B metal cation by an unsaturated hydrocarbon having a Lewis base strength equal to or greater than ethylene;
and
(b) an organometallic additive compound.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/496,378Filed 20 Mar 1990 · continuation in part
Priority: 30 Jan 1987
Granted: 6 Oct 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification21 codes

C08F 10/00
Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double
C07F 17/00
Metallocenes
B01J 31/146
Of aluminium or boron: of boron
B01J 31/2295
Unsaturated compounds used as ligands: cyclic compounds, e.g. cyclopentadienyls