Bimodal polyethylene resins and pipes produced therefrom
US10590213B2 · kind B2 · utility
14Cited by
16References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2018 |
| Grant date | Mar 17, 2020 |
| Priority date | — |
| Expiry date | Aug 10, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L9/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.