	US 11,945,897 B2
	Processes for preparing metallocene-based catalyst systems for the control of long chain branch content
Qing Yang, Bartlesville, OK (US); Max P. McDaniel, Bartlesville, OK (US); and Tony R. Crain, Niotaze, KS (US)
Assigned to Chevron Phillips Chemical Company LP, The Woodlands, TX (US)
Filed by Chevron Phillips Chemical Company LP, The Woodlands, TX (US)
Filed on Oct. 18, 2023, as Appl. No. 18/489,106.
Application 18/489,106 is a division of application No. 17/412,341, filed on Aug. 26, 2021.
Prior Publication US 2024/0043577 A1, Feb. 8, 2024
Int. Cl. C08F 4/64 (2006.01); C08F 4/52 (2006.01); C08F 4/659 (2006.01); C08F 4/6592 (2006.01); C08F 4/76 (2006.01); C08F 110/02 (2006.01); C08F 210/16 (2006.01)

CPC C08F 4/65912 (2013.01) [C08F 4/65916 (2013.01); C08F 4/65927 (2013.01); C08F 110/02 (2013.01); C08F 210/16 (2013.01); C08F 4/52 (2013.01); C08F 4/64 (2013.01); C08F 2410/07 (2021.01); C08F 2500/09 (2013.01)]

22 Claims

1. A polymerization process comprising:

(A) contacting a metallocene compound, a hydrocarbon solvent, and a first organoaluminum compound for a first period of time to form a metallocene solution, and contacting the metallocene solution with an activator-support and a second organoaluminum compound for a second period of time to form a high LCB catalyst composition;

(B) contacting the metallocene compound, the hydrocarbon solvent, the activator-support, and the second organoaluminum compound to form a low LCB catalyst composition;

(C) contacting the high LCB catalyst composition and/or the low LCB catalyst composition with ethylene and an optional olefin comonomer in a polymerization reactor system under polymerization conditions to produce an ethylene polymer having a long chain branch (LCB) content; and

(D) controlling a relative amount of the high LCB catalyst composition and the low LCB catalyst composition in step (C) to adjust the LCB content of the ethylene polymer.