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: 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 ...


4
D Emil Johnson, Charles M Krutchen, G Vincent Sharps Jr: Polymer foam process. Mobil Oil Corporation, Alexander J McKillop, James F Powers Jr, John K AboKhair, January 3, 1984: US04424287 (82 worldwide citation)

Thermoplastic foams of polystyrene, for example, are prepared with a blowing agent which is a mixture of an organic plasticizing blowing agent, such as pentane, and an atmospheric gas, such as carbon dioxide. Typically, such foams prepared with organic blowing agent alone were aged prior to thermofo ...


5
John A Ewen: Catalyst system for the polymerization of olefins. Fina Technology, Stuart L Watt, Jimmy D Wheelington, John K Abokhair, May 22, 1990: US04927797 (73 worldwide citation)

The present invention provides a catalyst system that exhibits unprecedented catalyst efficiencies and control of desired properties in the polymer product. The catalyst system includes a Toho-type, new generation titanium catalyst in combination with an electron donor described by the formula: ##ST ...


6
Edwar S Shamshoum, James T Merrill: Liquid phase aromatic conversion process. Fina Technology, Joseph A Schaper, William D Jackson, John K Abokhair, July 9, 1991: US05030786 (51 worldwide citation)

Aromatic conversion processes employing zeolite Y, zeolite omega and zeolite beta molecular sieve catalyst. A feed stock containing at least one aromatic compound and having water entrained therein is passed to a dehydration zone. In the dehydration zone, water is removed to provide a dehydrated fee ...


7
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 ...


8
James R Butler, William P Licht: Catalytic dewaxing process. Fina Technology, William D Jackson, John K Abokhair, M Norwood Cheairs, April 17, 1990: US04917789 (47 worldwide citation)

A process for reducing the pour point of sulfur containing gas oil fractions to produce fractions, including diesel oil of reduced pour point involving sequential hydrotreating and dewaxing of the gas oil feedstock. The hydrotreating step is carried out over a conventional hydrodesulfurization catal ...


9
John A Ewen: Polymerization of olefins with an improved catalyst system using a new electron donor. Fina Technology, Jim D Wheelington, John K Abokhair, M Norwood Cheairs, November 19, 1991: US05066738 (47 worldwide citation)

The present invention provides a catalyst system that exhibits unprecedented catalyst efficiencies and control of desired properties in the polymer product. The catalyst system includes a new generation titanium catalyst in combination with an electron donor described by the formula: ##STR1## wherei ...


10
Abbas Razavi, John A Ewen: Process for producing syndiotactic polyolefins. Fina Technology, Jim D Wheelington, John K Abokhair, M Norwood Cheairs, August 2, 1994: US05334677 (46 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 ...