Multimodal and broad molecular weight high density polyethylene
AssigneeExxonMobil Chemical Patents Inc.
InventorsAntonios K. Doufas, David F. Sanders, Alexander I. Norman, Matthew W. Holtcamp, Keith R. Green, Rohan A. Hule, Derek W. Thurman
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Abstract
This invention relates to new multimodal and/or broad molecular weight high density polyethylene polymers. The polymers may be made in a single reactor, preferably a gas phase reactor using a dual catalyst system comprising a pyridyldiamido transition metal compound, a metallocene compound, a support, and optionally an activator.
Claims10
A multimodal ethylene polymer comprising a low molecular weight fraction, LMWF, having a molecular weight of less than 100 kg/mol and a high molecular weight fraction, HMWF, having a molecular weight of more than 700 kg/mol, the polymer having:
- a. at least 50 mol% ethylene;
- b. a density of 0.938 to 0.965 g/cm3 according to ASTM D1505;
- c. a medium load melt index, I5, measured according to ASTM D1238(190° C., 5 kg weight), of 0.05 to 50 g/10 min;
- d. a flow index, I21, measured according to ASTM D1238(190° C., 21.6 kg weight), of 0.1 to 100 g/10 min;
- e. a ratio of Mz/Mw of greater than 5.5;
- f. at least two inflection points in a GPC-4D trace;
- and
- g. a strain hardening ratio, SHR, via SER of greater than 10 at a Hencky strain rate of 0.1 s−1 and/or 1 s−1.
Dependencies are inferred from the claim text.