Methods for Making High Density Polyethylene Compositions
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United States of America Patent
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Nov 8, 2017
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Dec 16, 2016
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Abstract
Methods for making a high density polyethylene composition are provided. The methods can include contacting ethylene and at least one non-ethylene comonomer with a catalyst system in a gas phase reactor in the presence of hydrogen at an ethylene partial pressure of 100 psi or more to produce a polyethylene copolymer. In one or more embodiments, the catalyst system can include one or more bis amides. The resulting polyethylene copolymer can have a density of about 0.945 g/cm3 or more; a melt index (I2) of about 5 dg/min to about 50 dg/min; a melt index ratio (I21/I2) of about 20 to about 35; and a molecular weight distribution of about 3.0 to about 10.
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