1
Kumudini C Jayaratne, Michael D Jensen, Qing Yang: Polymerization catalysts and process for producing bimodal polymers in a single reactor. Chevron Phillips Chemical Company, Merchant & Gould, June 5, 2007: US07226886 (143 worldwide citation)

Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. An improved method for preparing cyclopentadienyl complexes used to produce polyolefins is also provided.


2
Qing Yang, Kumudini C Jayaratne, Michael D Jensen, Max P McDaniel, Joel L Martin, Matthew G Thorn, Jerry T Lanier, Tony R Crain: Dual metallocene catalysts for polymerization of bimodal polymers. Chevron Phillips Chemical Company, Merchant & Gould P C, November 17, 2009: US07619047 (138 worldwide citation)

This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging η5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging η5-cyclopentadienyl-type ligands, ty ...


3
Joel L Martin, Matthew G Thorn, Max P McDaniel, Michael D Jensen, Qing Yang, Paul J DesLauriers, Mark E Kertok: Polymerization catalysts and process for producing bimodal polymers in a single reactor. Chevron Phillips Chemical Company, Merchant & Gould, December 25, 2007: US07312283 (119 worldwide citation)

Catalyst compositions comprising a first metallocene compound, a second metallocene compound, an activator-support, and an organoaluminum compound are provided. Methods for preparing and using such catalysts to produce polyolefins are also provided. The compositions and methods disclosed herein prov ...


4
Qing Yang, Michael D Jensen, Joel L Martin, Matthew G Thorn, Max P McDaniel, Youlu Yu, David C Rohlfing: Polymerization catalysts for producing high molecular weight polymers with low levels of long chain branching. Chevron Phillips Chemical Company, Merchant & Gould P C, April 14, 2009: US07517939 (110 worldwide citation)

This invention relates to catalyst compositions, methods, and polymers encompassing at least one Group 4 metallocene compound comprising bridging η5-cyclopentadienyl-type ligands, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclose ...


5
Max P McDaniel, Qing Yang, Randy S Muninger, Elizabeth A Benham, Kathy S Collins: Silica-coated alumina activator-supports for metallocene catalyst compositions. Chevron Phillips Chemical Company, Merchant & Gould P C, February 8, 2011: US07884163 (106 worldwide citation)

Silica-coated alumina activator-supports, and catalyst compositions containing these activator-supports, are disclosed. Methods also are provided for preparing silica-coated alumina activator-supports, for preparing catalyst compositions, and for using the catalyst compositions to polymerize olefins ...


6
Michael D Jensen, Max P McDaniel, Joel L Martin, Elizabeth A Benham, Randy Muninger, Gary Jerdee, Ashish M Sukhadia, Qing Yang, Matthew G Thorn: Catalyst compositions and polyolefins for extrusion coating applications. Chevron Phillips Chemical Company, Womble Carlyle Sandridge & Rice PLLC, May 9, 2006: US07041617 (98 worldwide citation)

This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, including polymerization methods using a supported catalyst composition. In one aspect, the present invention encompasses a catalyst composition com ...


7
Qing Yang, Michael D Jensen, Matthew G Thorn, Max P McDaniel, Joel L Martin, Tony R Crain: Polymerization catalysts for producing high melt index polymers without the use of hydrogen. Chevron Phillips Chemical Company, Womble Carlye Sandridge & Rice PLLC, April 11, 2006: US07026494 (94 worldwide citation)

Various catalyst compositions including the contact product of at least one ansa-metallocene compound, at least one organoaluminum compound, and at least one activator-support are disclosed. Processes for forming such compositions and for forming polyolefins with such compositions are also disclosed ...


8
Michael D Jensen, Gil R Hawley, Max P McDaniel, Tony Crain, Elizabeth A Benham, Joel L Martin, Qing Yang: Acidic activator-supports and catalysts for olefin polymerization. Chevron Phillips Chemical Co, Merchant & Gould, November 13, 2007: US07294599 (92 worldwide citation)

This invention relates to the field of olefin polymerization catalyst compositions, and methods for the polymerization and copolymerization of olefins, typically using a supported catalyst composition. In one aspect, this invention encompasses precontacting a metallocene with an olefin or alkyne mon ...


9
Qing Yang, Kumudini C Jayaratne, Michael D Jensen, Max P McDaniel, Joel L Martin, Matthew G Thorn, Jerry T Lanier, Tony R Crain: Dual metallocene catalysts for polymerization of bimodal polymers. Chevron Phillips Chemical Company, Merchant & Gould P C, June 14, 2011: US07960487 (72 worldwide citation)

This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging η5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging η5-cyclopentadienyl-type ligands, ty ...


10
Qing Yang, Max P McDaniel, Joel L Martin, Tony R Crain, Randy S Muninger, Jerry T Lanier, Jeff S Fodor, Paul J Deslauriers, Chung C Tso, David C Rohlfing: Process for producing broader molecular weight distribution polymers with a reverse comonomer distribution and low levels of long chain branches. Chevron Phillips Chemical Company, Merchant & Gould P C, February 14, 2012: US08114946 (72 worldwide citation)

The present invention provides a polymerization process which is conducted by contacting an olefin monomer and at least one olefin comonomer in the presence of hydrogen and a metallocene-based catalyst composition. Polymers produced from the polymerization process are also provided, and these polyme ...