US6265504B1
Expired / Lapsed
US
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Preparation of ultra-high-molecular-weight polyethylene
Assignee: Equistar Chemicals LP
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Filing: 1999-09-22
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Granted: 2001-07-24
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Expires: 2019-09-22
Abstract
Abstract An ultra-high-molecular-weight polyethylene (UHMWPE) is disclosed. The UHMWPE has a weight average molecular weight (Mw) greater than about 3,000,000 and molecular weight distribution less than about 5. A process for making the UHMWPE is also disclosed. The process is performed with a heteroatomic ligand-containing single-site catalyst in the presence of a non-alumoxane activator, but in the absence of an α-olefin, an aromatic solvent, and hydrogen.
Inventors
- 👤 Jia-Chu Liu
- 👤 Mark P. Mack
- 👤 Clifford C. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:23
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A process which comprises polymerizing ethylene at a temperature within the range of about 40° C. to about 110° C. in the presence of non-alumoxane activator and a single-site catalyst that comprises: (a) a Group 3-10 transition or lanthanide metal; and (b) a heteroatomic ligand selected from pyridinyl or quinolinyl; wherein the polymerization is performed in the absence of an aromatic solvent, an α-olefin comonomer, and hydrogen, and wherein the resulting polyethylene has a Mw greater than about 3,000,000 and a Mw/Mn less than about 5.0.
Claim 2
Dependent Claim
86 words
A process which comprises polymerizing ethylene at a temperature within the range of about 40° C. to about 110° C. in the presence of non-alumoxane activator and a single-site catalyst that comprises: (a) a Group 3-10 transition or lanthanide metal; and (b) a heteroatomic ligand selected from pyridinyl or quinolinyl; wherein the polymerization is performed in the absence of an aromatic solvent, an α-olefin comonomer, and hydrogen, and wherein the resulting polyethylene has a Mw greater than about 3,000,000 and a Mw/Mn less than about 5.0.
Claim 3
Dependent Claim
9 words
A gas phase polymerization process of claim 1 .
Claim 4
Dependent Claim
9 words
A solution polymerization process of claim 1 in isobutane.
Claim 5
Dependent Claim
8 words
A slurry polymerization process of claim 1 .
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein the transition metal is a Group 4 metal.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the transition metal is zirconium.
Claim 8
Dependent Claim
37 words
The process of claim 1 wherein the non-alumoxane activator is selected from the group consisting of trialkyl amines, alkyl aluminums, alkyl aluminum halides, anionic compounds boron or aluminum, trialkyl boron compounds, triaryl boron compounds, and mixtures thereof.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the activator is triethyl aluminum.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-07-23 | 2005-01-22 | 2005-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-07-23 | 2009-01-22 | 2009-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-07-23 | 2013-01-22 | 2013-07-24 | $7700.00 | Window Closed / Lapsed |