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AssigneeEquistar Chemicals, LP
InventorsPhilip Garrison, Charles Holland, Mark Mack, Linda Winslow, Everett Lewis, James Clark, Leonard Cribbs, Bradley Etherton, Jean Merrick-Mack, Paula Nygard
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An ethylene polymerization process is disclosed. Ethylene is polymerized in two slurry reaction zones with a C6-C10 alpha-olefin in the presence of a single-site catalyst capable of making a high molecular weight polyolefin. The process yields medium density and linear low density polyethylene having a bimodal molecular weight distribution and a melt index from about 0.10 to about 0.80. Films from the polyethylene have superior impact properties.
A process which comprises polymerizing ethylene with a C6-C10 alpha-olefin in two slurry reaction zones in the presence of a single-site catalyst system comprising an activator and a supported Group 4-6 transition metal complex to produce polyethylene, wherein from about 35 to about 75 wt. % of the polyethylene is produced in a first reaction zone with a hydrogen to ethylene molar ratio in the vapor phase of from about 0.00005:1 to about 0.01:1 to produce a first-zone material having a melt index of from about 1 to about 300 dg/min which is transferred as a slurry to a second reaction zone having a hydrogen to ethylene molar ratio in the vapor phase of from about 0.000001:1 to about 0.003:1 to produce polyethylene with a bimodal molecular weight distribution, a density of from about 0.91 to about 0.94 g/cm3, and a melt index of from about 0.10 to about 0.80 dg/min.
Dependencies are inferred from the claim text.