1
John A Ewen: Hafnium metallocene catalyst for the polymerization of olefins. Fina Technology, John K Abokhair, Stuart L Watt, M Norwood Cheairs, December 27, 1988: US04794096 (318 worldwide citation)

The present invention provides a catalyst system for the polymerization and copolymerization of olefins with the system comprising a chiral, stereorigid hafnium metallocene catalyst in combination with an aluminum compound. The aluminum compound is preferably an alumoxane and may be a mixture of alu ...


2
John A Ewen, Abbas Razavi: Process and catalyst for producing syndiotactic polyolefins. Fina Technology, Stuart L Watt, John K Abokhair, M Norwood Cheairs, January 9, 1990: US04892851 (286 worldwide citation)

The invention provides a metallocene catalyst for use in preparing syndiotactic polyolefins. The catalyst comprises a bridged metallocene in which one of the cyclopentadienyl rings is substituted in a substantially different manner from the other ring. It was discovered that this type of catalyst is ...


3
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 ...


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
Granville J Hahn: Plastic container with decreased gas permeability. Cosden Technology, Michael J Caddell, M Norwood Cheairs, November 12, 1985: US04552791 (76 worldwide citation)

A container made of an organic resin having improved vapor barrier characteristics is disclosed which achieves an improved barrier by the placement thereon of a thin coating of an inorganic material.


7
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 ...


8
William R Wheat, Aiko Hanyu: Biaxially-oriented metallocene-based polypropylene films. Fina Technology, Jim Wheelington, William D Jackson, M Norwood Cheairs, July 18, 2000: US06090325 (51 worldwide citation)

A process for the production of biaxially-oriented polypropylene film involving the provision of a polypropylene polymer produced by the polymerization of propylene in the presence of a metallocene catalyst characterized by a bridged racemic bis(indenyl) ligand substituted at the proximal position. ...


9
John A Ewen, Alan H Bitzer: Catalyst pretreatment process. Cosden Technology, William D Jackson, John K Abokhair, M Norwood Cheairs, August 30, 1988: US04767735 (49 worldwide citation)

A process for pretreating a Ziegler-type catalyst for use in olefin polymerization reactions. An olefin monomer is aded to a fluid carrier stream containing a Ziegler-type catalyst. The carrier stream containing the monomer and the catalyst is passed through an elongated tubular reactor at a flow ra ...


10
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 ...