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Multimodal polyethylene pipe resins and process
US9249286B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9249286-B2 |
| Application number | US-28744908-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 9, 2008 |
| Priority date | Oct 9, 2008 |
| Publication date | Feb 2, 2016 |
| Grant date | Feb 2, 2016 |
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Abstract
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Multimodal polyethylene resins having improved stress crack resistance and melt strength rendering them useful for the manufacture of thick-walled pipe are produced in a process wherein the second stage of the process is a copolymerization conducted at a high temperature with a low comonomer to ethylene ratio and a low hydrogen to ethylene ratio.
First claim
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I claim: 1. A multimodal polyethylene resin, said multimodal resin comprised of: (i) a first polyethylene resin having a first molecular weight and having a density from 0.965 to 0.975 g/cm 3 and MI 2 from 50 to 400 g/10 min and (ii) a second copolymer resin comprising lower density ethylene-C 3-8 α-olefin copolymer resin having a second molecular weight wherein the second molecular weight is higher than the first molecular weight, wherein said multimodal resin having a den…
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Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
- C08L23/06Primary
Chemistry & Metallurgy · mapped topic
Cross-Sectional Technologies · mapped topic
Chemistry & Metallurgy · mapped topic
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- What does patent US9249286B2 cover?
- Multimodal polyethylene resins having improved stress crack resistance and melt strength rendering them useful for the manufacture of thick-walled pipe are produced in a process wherein the second stage of the process is a copolymerization conducted at a high temperature with a low comonomer to ethylene ratio and a low hydrogen to ethylene ratio.
- Who is the assignee on this patent?
- Joseph Sebastian, Equistar Chem Lp
- What technology area does this patent fall under?
- Primary CPC classification C08L23/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Feb 02 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).