Pipes including high density multimodal polyethylene compositions
AssigneeDow Global Technologies LLC
InventorsElva L. Lugo, Andrew T. Heitsch, Todd A. Hogan, Rachel C. Anderson, Joel D. Wieliczko, Paul Balding, Rujul Mehta
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Abstract
The present invention relates to a pipe including a multimodal high density polyethylene composition, as well as processes for making the pipe. The multimodal high density polyethylene composition includes a high molecular weight component and a low molecular weight component and can be made in a single reactor. The combination of properties of the composition deliver a desirable balance of ESCR, flexibility, and stiffness particularly suitable for pipe such as conduit and pressure-less pipe applications.
Claims11
A pipe comprising a multimodal high density polyethylene composition, the multimodal high density polyethylene composition comprising greater than 40 wt. % of a high molecular weight component and less than 60 wt. % of a low molecular weight component, based on the total weight of the multimodal high density polyethylene composition, wherein the multimodal high density polyethylene composition has:
- a. a density greater than 0.950 g/cm3;
- b. a high load melt index (I21) of from 20.0 to 35.0 g/10 min;
- c. a viscosity at 0.1 rad/sec of greater than 30,000 Pas;
- d. a shear thinning ratio of from 15.0 to 25.0;
- e. a PENT value greater than 30 hours;
- f. a strain hardening modulus of greater than 30.00 MPa;
- and
- g. a Mz/Mw of greater than 5.5.
Dependencies are inferred from the claim text.