Production of polyethylene having a bimodal molecular weight dis

Details Production of polyethylene having a bimodal molecular weight dis Production of polyethylene having a bimodal molecular weight dis

1997-12-22

2000-01-18

Wu, David W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526106, 526118, 526126, 502319, C08F 406

Patent

active

060158662

ABSTRACT:
A process for producing high density polyethylene, the process comprising polymerising ethylene, or copolymerising ethylene and an alpha-olefinic comonomer comprising from 3 to 10 carbon atoms, in the presence of a catalyst system comprising first and second chromium-based catalysts, the first chromium-based catalyst having been reduced and reoxidised and the second chromium-based catalysts having been activated, fluordised before or during the activation step, and reduced, the first and second chromium-based catalysts having a pore volume difference of at least O.8 cc/g. There is further provided a catalyst system for the production of high density polyethylene by polymerising ethylene or copolymerising ethylene and an alpha-olefinic comonomer comprising from 3 to 10 carbon atoms, the catalyst system comprising first and second chromium-based catalysts, the first chromium-based catalyst having been reduced and reoxidised and the second chromium-based catalyst having been activated, fluoridised before or after the activation step, and reduced, and the first and second chromium-based catalysts having a pore volume difference of at least 0.8 cc/g. There is further provided the use of the catalyst system for increasing the bimodalty of the molecular weight distribution of a high density polyethylene.

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