07960487 is referenced by 72 patents and cites 168 patents.

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, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclosed herein provide ethylene polymers with a bimodal molecular weight distribution.

Title
Dual metallocene catalysts for polymerization of bimodal polymers
Application Number
12/571824
Publication Number
7960487 (B2)
Application Date
October 1, 2009
Publication Date
June 14, 2011
Inventor
Tony R Crain
Niotaze
KS, US
Jerry T Lanier
Bartlesville
OK, US
Matthew G Thorn
Mason
OH, US
Joel L Martin
Bartlesville
OK, US
Max P McDaniel
Bartlesville
OK, US
Michael D Jensen
Laurel
MD, US
Kumudini C Jayaratne
Groningen
NL
Qing Yang
Bartlesville
OK, US
Agent
Merchant & Gould P C
Assignee
Chevron Phillips Chemical Company
TX, US
IPC
B01J 31/22
C08F 4/76
C08F 4/6592
C08F 4/02
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