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US5565397A
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Olefin polymerization catalyst comprising a metallocene and an anhydrous lithium halide-treated alkylaluminoxane
Assignee: Albemarle Corp
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Filing: 1995-05-12
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Granted: 1996-10-15
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Expires: 2015-05-12
Abstract
Abstract Alkylaluminoxanes having improved catalytic activity such as when they are used in combination with metallocenes for the polymerization of alpha-olefins, are prepared by treating an organic solvent solution of an alkylaluminoxane, such as methylaluminoxane, with anhydrous lithium halide.
Inventors
- 👤 Samuel A. Sangokoya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:46
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F5/068
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
An olefin polymerization catalyst comprising a metallocene and an alkylaluminoxane prepared by the process comprising treating an organic solvent solution of alkylaluminoxane, said alkylaluminoxane having been prepared by adding free water to an organic solvent solution of alkylaluminum, with anhydrous LiX, wherein X is selected from the group consisting of chloride, fluoride and bromide, in proportions of at least about 0.01 mole of LiX per mole of aluminum in the alkylaluminoxane.
Claim 2
Dependent Claim
71 words
An olefin polymerization catalyst comprising a metallocene and an alkylaluminoxane prepared by the process comprising treating an organic solvent solution of alkylaluminoxane, said alkylaluminoxane having been prepared by adding free water to an organic solvent solution of alkylaluminum, with anhydrous LiX, wherein X is selected from the group consisting of chloride, fluoride and bromide, in proportions of at least about 0.01 mole of LiX per mole of aluminum in the alkylaluminoxane.
Claim 3
Dependent Claim
10 words
The catalyst of claim 1 wherein said alkylaluminoxane is methylaluminoxane.
Claim 4
Dependent Claim
12 words
The catalyst of claim 1 wherein said solvent is an aromatic hydrocarbon.
Claim 5
Dependent Claim
10 words
The catalyst of claim 3 wherein said solvent is toluene.
Claim 6
Dependent Claim
28 words
The catalyst of claim 2 wherein said LiX is used in proportions of from about 0.01 to 0.2 moles of LiX per mole of aluminum in the methylaluminoxane.
Claim 7
Dependent Claim
27 words
The catalyst of claim 1 wherein the mole ratio of metal atom in said metallocene to aluminum atom in said alkylaluminoxane is from about 0.0002:1 to 0.2:1.
Claim 8
Dependent Claim
27 words
The catalyst of claim 1 wherein the mole ratio of metal atom in said metallocene to aluminum atom in said alkylaluminoxane is from about 0.0005:1 to 0.2:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-15 | 2000-04-15 | 2000-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-15 | 2004-04-15 | 2004-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-15 | 2008-04-15 | 2008-10-15 | $7700.00 | Window Closed / Lapsed |