1
John A Ewen, Michael J Elder: Preparation of metallocene catalysts for polymerization of olefins. Fina Technology, Jim D Wheelington, M Norwood Cheairs, February 7, 1995: US05387568 (141 worldwide citation)

This invention uses a new method of producing ionic metallocene compounds. These compounds are useful as catalysts for polymerization of olefins, primarily propylene. This method uses an ionizing agent which ionizes the neutral metallocene compound. The ionizing ionic compound does not contain an ac ...


2
Michael J Elder, Abbas Razavi, John A Ewen: Process and catalyst for producing syndiotactic polyolefins. Fina Technology, William D Jackson, Jim D Wheelington, October 13, 1992: US05155080 (134 worldwide citation)

Syndiospecific catalysts and processes for the syndiotactic propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is a substituted vinyl compound. The catalysts comprise an unbalanced metallocene cation, characterized by a cationic ...


3
John A Ewen, Michael J Elder: Process and catalyst for producing isotactic polyolefins. Fina Technology, Jim D Wheelington, M Norwood Cheairs, May 16, 1995: US05416228 (87 worldwide citation)

This invention is for a metallocene catalyst component useful in preparing isotactic polyolefins, a catalyst system using this component and a process for polymerizing olefins using the catalyst component. The catalyst component consists of a bridged metallocene in which one of the cyclopentadienyl ...


4
Michael J Elder, Abbas Razavi, John A Ewen: Process and catalyst for producing syndiotactic polyolefins. Fina Technology, William D Jackson, Jim D Wheelington, M Norwood Cheairs, July 6, 1993: US05225500 (72 worldwide citation)

Syndiospecific catalysts and processes for the syndiotactic propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is a substituted vinyl compound. The catalysts comprise an unbalanced metallocene cation, characterized by a cationic ...


5
John A Ewen, Michael J Elder: Catalyst and process for polymerization of olefins. Fina Technology, Jim D Wheelington, M Norwood Cheairs, September 2, 1997: US05663249 (48 worldwide citation)

This invention uses a new method of producing ionic metallocene compounds. These compounds are useful as catalysts for polymerization of olefins, primarily propylene. This method uses an ionizing agent which ionizes the neutral metallocene compound. The ionizing ionic compound does not contain an ac ...


6
John A Ewen, Michael J Elder: Metallocene catalysts with lewis acids and aluminum alkyls. Fina Technology, Jim D Wheelington, M Norwood Cheairs, October 1, 1996: US05561092 (47 worldwide citation)

This invention is for a catalyst system comprising a neutral metallocene compound, an aluminum alkyl and a Lewis acid. The Lewis acid must be of sufficient acidity to ionize a neutral metallocene compound to form a cationic metallocene catalyst. The ligands of the Lewis acid should not be reactive w ...


7
John A Ewen, Michael J Elder, Robert L Jones: Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins. Basell Technology Company, Bryan Cave, October 21, 2003: US06635779 (47 worldwide citation)

A class of metallocene compounds is disclosed having general formula (I) wherein Y is a moiety of formula (II) wherein A, B, and D, same or different from each other, are selected from an element of the groups 14 to 16 of the Periodic Table of the Elements (new IUPAC version), with the exclusion of ...


8
Edwar S Shamshoum, Michael J Elder, Baireddy R Reddy, David J Rauscher: Method of making a homogeneous-heterogenous catalyst system for olefin polymerization. Fina Technology, Jim Wheelington, M Norwood Cheairs, March 7, 1995: US05395810 (40 worldwide citation)

This invention concerns a making a catalyst system comprising at least one homogeneous catalyst and at least one heterogeneous catalyst, specifically, a metallocene catalyst and a conventional Ziegler-Natta catalyst, respectively. This invention is useful for making a catalyst for the polymerization ...


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John A Ewen, Michael J Elder: Addition of aluminum alkyl for improved metallocene catalyst. Fina Technology, Jim D Wheelington, M Norwood Cheairs, May 21, 1996: US05519100 (30 worldwide citation)

This invention is for a catalyst system for polymerization of olefins using an ionic metallocene catalyst with aluminum alkyl. The metallocene catalyst is an ion pair formed from a neutral metallocene compound and an ionizing compound. The invention can be used in any method of producing ionic metal ...