US5157137A
Expired / Lapsed
US
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Method of making gel free alkylaluminoxane solutions
Assignee: Albemarle Corp
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Filing: 1991-07-26
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Granted: 1992-10-20
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Expires: 2011-07-26
Abstract
Abstract Clear, gel free solutions of alkylaluminoxane, such as methylaluminoxane, in an organic solvent, such as toluene, are provided by treating a solution of the alkylaluminoxane with an anhydrous salt and/or hydroxide of an alkali or alkaline earth metal and then removing the solids from the solution such as by filtration.
Inventors
- 👤 Samuel A. Sangokoya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:44
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F5/068
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
53 words
A method of making a clear, gel free solution of alkylaluminoxane comprising treating an organic solvent solution of alkylaluminoxane with an anhydrous salt, an anhydrous hydroxide, or a mixture of an anhydrous salt and hydroxide of a metal selected from alkali and alkaline earth metals and then separating the solids from said solution.
Claim 2
Independent Claim
53 words
A method of making a clear, gel free solution of alkylaluminoxane comprising treating an organic solvent solution of alkylaluminoxane with an anhydrous salt, an anhydrous hydroxide, or a mixture of an anhydrous salt and hydroxide of a metal selected from alkali and alkaline earth metals and then separating the solids from said solution.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein the alkylaluminoxane is methylaluminoxane.
Claim 4
Dependent Claim
12 words
The method of claim 2 wherein the solvent is an aromatic hydrocarbon.
Claim 5
Dependent Claim
10 words
The method of claim 3 wherein the solvent is toluene.
Claim 6
Dependent Claim
10 words
The method of claim 2 wherein the metal is lithium.
Claim 7
Dependent Claim
14 words
The method of claim 5 wherein anhydrous lithium hydroxide is used in the process.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein anhydrous lithium bromide is used in the process.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the solids are separated by filtering the solution.
Claim 10
Independent Claim
52 words
A method of removing gel from a hydrocarbon solvent solution of methylaluminoxane comprising mixing an anhydrous salt, an anhydrous hydroxide, or a mixture of an anhydrous salt and hydroxide of an alkali metal or an alkali earth metal with said solution containing said gel and then separating the solids from said solution.
Claim 11
Independent Claim
52 words
A method of removing gel from a hydrocarbon solvent solution of methylaluminoxane comprising mixing an anhydrous salt, an anhydrous hydroxide, or a mixture of an anhydrous salt and hydroxide of an alkali metal or an alkali earth metal with said solution containing said gel and then separating the solids from said solution.
Claim 12
Dependent Claim
19 words
The method of claim 9 wherein said solvent is an aromatic hydrocarbon and said metal is an alkali metal.
Claim 13
Dependent Claim
15 words
The method of claim 10 wherein said solvent is toluene and said metal is lithium.
Claim 14
Dependent Claim
26 words
The method of claim 9 wherein anhydrous lithium hydroxide is mixed with the solution and the solids are separated from the solution by filtering the solution.
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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) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |