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: Catalyst for producing hemiisotactic polypropylene. Fina Technology, Jim D Wheelington, July 30, 1991: US05036034 (105 worldwide citation)

This invention is for a metallocene compound which can be used in a catalyst system to produce hemiisotactic polymer. The compound is a bridged metallocene compound having dissimilar cyclopentadienyl groups and no bi-lateral symmetry. One example of the compound is isopropylidene(3-methylcyclopentad ...


4
John A Ewen: Catalyst systems for producing polyolefins having a broad molecular weight distribution. Fina Technology, Jim D Wheelington, John K Abokhair, M Norwood Cheairs, December 4, 1990: US04975403 (90 worldwide citation)

The invention provides catalyst systems for use in the polymerization of olefins to produce a polymer product having a broad molecular weight distribution. The catalyst system includes at least two different chiral, stereo-rigid metallocene catalysts of the formula R"(C.sub.5 (R').sub.4).sub.2 MeQp ...


5
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 ...


6
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 ...


7
Abbas Razavi: Non-bridged syndiospecific metallocene catalysts and polymerization process. Fina Technology, William D Jackson, Jim D Wheelington, November 10, 1992: US05162278 (52 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 substituted vinyl compound. The catalysts comprise unbalanced stereorigid metallocenes in which a structural bridge ...


8
Marc Dupire, Jacques Michel: Reinforced polymers. Atofina Research, Jim D Wheelington, December 18, 2001: US06331265 (51 worldwide citation)

Provided is a method for the production of a reinforced polymer, which method comprises:


9
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 ...


10
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 ...