TH84549A - Two-mode polyethylene blends, high durability - Google Patents

Abstract

DC60 (04/09/53) was disclosed as a composite of various materials, including but not limited to two-mode polyethylene composites of high durability with a density of 0.940 g/cc or greater, composites incorporating a high molecular weight polyethylene component with a higher average molecular weight (Mw HMW) and a low molecular weight polyethylene component with a lower average molecular weight (Mw LMW), in which: the ratio of higher average molecular weight to lower average molecular weight (Mw HMW: Mw LMW) is 30 or greater, and the composites are available as PE 100 material in which, according to ISO 1167, tubes constructed from the composites have an internal tube resistance of an additional 10 MPa or greater when the internal tube resistance curve is drawn for 50 or 100 years according to ISO 9080:2003(E). High durability with a density of 0.940 g/cc or greater, composite material consisting of high molecular weight polyethylene (Mw HMW) and low molecular weight polyethylene (Mw LMW) components, where: the ratio of higher molecular weight to lower molecular weight (Mw HMW:Mw LMW) is 30 or greater, and the composite material is usable as PE 100 material where, according to ISO 1167, the tube is constructed from the composite material and has an internal tube resistance of 10 MPa or greater when the internal tube resistance curve is extended for 50 or 100 years according to ISO 9080:2003 (E).

Claims (15)

1. High-strength two-mode polyethylene composites with a density of 0.940 g/cc or greater; the composite consists of a high molecular weight polyethylene component and a low molecular weight polyethylene component, where: the ratio of the molecular weight mean (MwHMW) of the high molecular weight component to the molecular weight mean (MwHMW:MwLMW) is 30 or greater; and the composite is used as PE 100 material where, according to ISO 1167, pipes constructed from the composite have an internal pipe resistance of 10 MPa or greater when the internal pipe resistance curve is drawn for 50 or 100 years according to ISO 9080:2003 (E). 2. A mixture of claims under patent 1, consisting of a high molecular weight polyethylene component with a density of 0.945 or lower. 3. A mixture of claims under patent 1, consisting of a low molecular weight polyethylene component with a density of 0.940 or greater. 4. The mixture of claims 1, with an average molecular weight (Mw) of the low molecular weight polyethylene components meaning from 5,000 to 30,000. 5. The mixture of claims 1, with an average molecular weight (Mw) of the high molecular weight polyethylene components meaning from 300,000 to 800,000. 6. The mixture of claim 1 shall consist of high molecular weight polyethylene, including polyethylene, and polyethylene comonomers selected from groups containing butene, hexene, and octene, where the comonomers are present in an amount greater than 1.0 weight% of the polyethylene. 7. The mixture of claim 1 shall consist of low molecular weight polyethylene components, including polyethylene, which includes comonomers selected from groups containing butene, hexene, and octeene, where the comonomers are present in amounts less than 3.0 weight % of the polyethylene. 8. A combination of claims 1 where the tensile stress is extended to 10.5 megapascals or more for 50 or 100 years according to ISO 9080:2003 (E). 9. The mixture of claim 1, by FI (I21) of the mixture means from 5 to 12 g/10 min. 10. A combination of claims under Clause 1 with an MFR(I21/I2) from 80 to 250. 11. A combination of Claim 1 with a total PDI of 25 or more. 12. A mixture of claim 1, with a high molecular weight polyethylene component and a low molecular weight polyethylene component, is formed in a single reactor. 13. A mixture of claim 1, consisting of a high molecular weight polyethylene component and a lower molecular weight polyethylene component, is formed in separate reactors. 14. The mixture of Claim 1 is a physical mixture of low molecular weight polyethylene components formed in separate reactors and subsequently mixed together after formation. 15. A mixture of claims 1, consisting of high and low molecular weight polyethylene components, is formed by polymerization in the presence of a catalytic system that includes pentamethyl cyclopentadienyl, n-propyl cyclopentadienyl zirconium dichloride.