1
Ching Tai Lue, Donna J Crowther: Mixed catalysts and their use in a polymerization process. Univation Technologies, Jaimes Sher, March 27, 2001: US06207606 (108 worldwide citation)

The present invention relates to a mixed catalyst system of at least one bridged, bulky ligand metallocene-type compound, and at least one bridged, asymmetrically substituted, bulky ligand metallocene-type compound, a method of making the mixed catalyst system and to its use in a polymerization proc ...


2
Donna J Crowther, Richard A Fisher, Jo Ann M Canich, Gregory G Hlatky, Howard W Turner: Transition metal olefin polymerization catalysts. Exxon Chemical Patents, F E Reid, M S Spiering, April 2, 1996: US05504049 (75 worldwide citation)

This invention relates to non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Compositions useful as ...


3
Charles C Cozewith, Sudhin Datta, Bruce A Harrington, Bernard J Folie, John F Walzer Jr, Donna J Crowther: Method for making polymer blends by using series reactors. Exxon Mobil Chemical Patents, Anthony Chi, Stephen D Prodnuk, November 20, 2001: US06319998 (65 worldwide citation)

This invention relates to a method of making polymer blends using series reactors and a metallocene catalyst. Monomers used by the invention are ethylene, a higher alpha-olefin (propylene most preferred), and optionally, a non-conjugated diene (ethylidene norbornene, i.e., ENB, most preferred). More ...


4
Donna J Crowther, Ching Tai Lue: Polymerization process for producing easier processing polymers. Univation Technologies, Jaimes Sher, Lisa Kimes Jones, January 15, 2002: US06339134 (57 worldwide citation)

The present invention relates to a process for polymerizing olefin(s) utilizing a cyclic bridged metallocene-type catalyst system to produce enhanced processability polymers.


5
Donna J Crowther, Richard A Fisher, Jo Ann M Canich, Gregory G Hlatky, Howard W Turner: Transition metal olefin polymerization processes. Exxon Chemical Patents, M S Spiering, F E Reid, March 26, 1996: US05502124 (31 worldwide citation)

This invention relates to processes using non-Group 4 transition metal compositions useful as olefin polymerization catalysts, wherein the transition metal is in a high oxidation state. The invention further relates to design of new ligand systems and methods of preparing and using the same. Composi ...


6
Patrick Brant, Donna J Crowther: Functionalized high vinyl terminated propylene based oligomers. ExxonMobil Chemical Patents, Catherine L Bell, March 19, 2013: US08399725 (27 worldwide citation)

This invention relates to a functionalized co-oligomer having an Mn of 300 to 30,000 g/mol comprising 10 to 90 mol % propylene and 10 to 90 mol % of ethylene, wherein the oligomer has at least X % allyl chain ends, where: 1) X=(−0.94(mole % ethylene incorporated)+100), when 10 to 60 mole % ethylene ...


7
Rinaldo S Schiffino, Donna J Crowther, Bernard J Folie, John F Walzer Jr: Polymerization process for olefin copolymers using bridged hafnocene compounds. Exxon Mobil Chemical Patents, William G Muller, Charles E Runyan, April 17, 2001: US06218488 (27 worldwide citation)

The invention is a polymerization process for ethylene copolymers having a density less than 0.915 comprising contacting ethylene, one or more &agr;-olefin monomer, and optionally one or more diene monomer, with a catalyst composition comprising the reaction product of at least one organometallic Gr ...


8
John R Hagadorn, Matthew W Holtcamp, Andrew G Narvaez Jr, Donna J Crowther, Patrick Brant: Olefin functionalization by metathesis reaction. ExxonMobil Chemical Patents, Catherine L Bell, October 9, 2012: US08283419 (25 worldwide citation)

This invention relates to a process to functionalize propylene co-oligomer comprising contacting an alkene metathesis catalyst with a heteroatom containing alkene, and a propylene a co-oligomer having an Mn of 300 to 30,000 g/mol comprising 10 to 90 mol % propylene and 10 to 90 mol % of ethylene, wh ...


9
Patrick Brant, Donna J Crowther, Andrew G Narvaez Jr: High vinyl terminated propylene based oligomers. ExxonMobil Chemical Patents, Catherine L Bell, February 12, 2013: US08372930 (24 worldwide citation)

This invention relates to a co-oligomer having an Mn of 300 to 30,000 g/mol comprising 10 to 90 mol % propylene and 10 to 90 mol % of ethylene, wherein the oligomer has at least X % allyl chain ends, where: 1) X=(−0.94 (mole % ethylene incorporated)+100), when 10 to 60 mole % ethylene is present in ...


10
Donna J Crowther, Ching Tai Lue: Polymerization process for producing easier processing polymers. Univation Technologies, Jaimes Sher, Lisa Kimes Jones, May 14, 2002: US06388115 (20 worldwide citation)

The present invention relates to a process for polymerizing olefin(s) utilizing a cyclic bridged metallocene-type catalyst system to produce enhanced processability polymers.