Cocatalyst Activation of Constrained Geometry Catalyst

Note that other key features of Dow s continuous solution process are the relatively high ethylene conversion rates and the relatively short catalyst 

Although MAO is an effective cocatalyst in activating the Dow catalyst, overall activity (g PE/g Metal) is relatively lower than the metallocene/ MAO catalyst, and a higher overall activity is preferred for a commercial catalyst system. 

As discussed above with Chevron-Phillips metallocene-based catalyst which is activated with solid acid catalyst supports, the introduction of low levels of long-chain branching is an important structural feature of polyethylene manufactured for commercial applications with single-site catalysts. Dow s CGC system is able to incorporate low levels of long-chain branching into the polyethylene due to the high level of vinyl-terminated polymer molecules, the relatively high polymerization temperature that is 

the polyethylene manufactured with Dow s catalyst system possesses sufficient levels of long-chain branching to impart higher levels of shear-thinning in the polymer melt, low melt fracture and high melt strength during the polyethylene fabrication process. 

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