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US 5,470,927 AGranted
Ionic metallocene catalyst compositions
AssigneeExxon Chemical Patents Inc.
InventorsHoward W. Turner, Gregory G. Hlatky, Richard R. Eckman
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AssigneeExxon Chemical Patents Inc.
InventorsHoward W. Turner, Gregory G. Hlatky, Richard R. Eckman
Estimating the term…
A method is disclosed for polymerizing olefins, diolefins, or acetylenically unsaturated monomers containing two or more carbon atoms, either alone or in combination with each other or with other polymerizable monomers, comprising contacting the monomers with an ionic polymerization catalyst comprising (1) a cation derived from a bis(cyclopentadienyl) Group IV-B metal compound by abstracting a ligand to create a positively charged species and (2) a stabilizing non-coordinating anion, said anion being sufficiently labile to permit displacement by the olefin, diolefin and/or acetylenically unsaturated monomer during polymerization. The process provides means of producing narrow molecular weight polyolefin polymers, increasing comonomer incorporation in copolymers and avoiding metal impurities in the polymer products.
A method for polymerizing olefins, diolefins, or acetylenically unsaturated monomers containing two or more carbon atoms, either alone or in combination with each other or with other polymerizable monomers, comprising contacting the monomers with an ionic polymerization catalyst comprising (1) a cation derived from a bis(cyclopentadienyl) Group IV-B metal compound by abstracting a ligand to create a positively charged species and (2) a stabilizing non-coordinating anion, said anion being sufficiently labile to permit displacement by an olefin, diolefin and/or acetylenically unsaturated monomer during polymerization.
The method of claim F for the polymerization of propylene or higher .alpha.-olefins.
A method for polymerizing an olefin, diolefin, and/or acetylenically unsaturated monomers comprising the step of contacting one or more of said monomers under polymerization conditions with an ionic polymerization catalyst comprising a cation derived from a hydrolyzable bis (cyclopentadienyl) Group IV-B metal compound and a stabilizing non-coordinating anion, said anion being sufficiently labile to permit displacement by an olefin diolefin and/or acetylenically unsaturated monomer during polymerization.
Dependencies are inferred from the claim text.