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US 10,590,213 B2Granted
Bimodal polyethylene resins and pipes produced therefrom
AssigneeChevron Phillips Chemical Company LP
InventorsVivek Rohatgi, Ashish M. Sukhadia, Yongwoo Inn, Elizabeth M. Lanier
Life of this patent
Estimating the term…
Abstract
Disclosed herein are ethylene-based polymers generally characterized by a density of at least 0.94 g/cm3, a high load melt index from 4 to 20 g/10 min, a zero-shear viscosity at 190° C. from 20,000 to 400,000 kPa-sec, and a relaxation time at 190° C. from 225 to 3000 sec. These ethylene polymers can be produced by peroxide-treating a broad molecular weight distribution Ziegler-catalyzed resin, and can be used in large diameter, thick wall pipes and other end-use applications.
Claims20
An ethylene polymer having:
- a density of at least about 0.94 g/cm3;
- a HLMI (I21) in a range from about 4 to about 20 g/10 min;
- a ratio of Mw/Mn in a range from about 13 to about 38;
- a zero-shear viscosity (go) at 190° C. in a range from about 20,000 to about 400,000 kPa-sec;
- and
- a relaxation time (τη) at 190° C. in a range from about 225 to about 3000 sec.
3 more elements
A pipe comprising:
- an ethylene polymer characterized by a density of at least about 0.94 g/cm3, a HLMI (I21) in a range from about 4 to about 20 g/10 min, a ratio of Mw/Mn in a range from about 13 to about 38, a zero-shear viscosity (η0) at 190° C. in a range from about 20,000 to about 400,000 kPa-sec, and a relaxation time (τη) at 190° C. in a range from about 225 to about 3000 sec;
- and
- an additive selected from an antioxidant, an acid scavenger, an antiblock additive, a slip additive, a colorant, a filler, a processing aid, a UV inhibitor, or any combination thereof.
An ethylene polymer having:
- a density of at least about 0.94 g/cm3;
- a HLMI (I21) in a range from about 4 to about 20 g/10 min;
- a Mn in a range from about 10,200 to about 16,100 g/mol;
- a zero-shear viscosity (η0) at 190° C. in a range from about 20,000 to about 400,000 kPa-sec;
- and
- a relaxation time (τη) at 190° C. in a range from about 225 to about 3000 sec.
3 more elements
Dependencies are inferred from the claim text.