Patent US5248801A successfully refreshed from Google Patents.
US5248801A
Expired / Lapsed
US
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Preparation of methylaluminoxanes
Assignee: Albemarle Corp
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Filing: 1992-08-27
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Granted: 1993-09-28
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Expires: 2012-08-27
Abstract
Abstract Soluble methylaluminoxane is prepared by reacting water with a solution of an alkylaluminum compound, wherein at least about half the alkyl groups are methyl groups, in a 1:4 to 4:1 by volume aliphatic hydrocarbon/aromatic hydrocarbon solvent mixture, wherein the aliphatic hydrocarbon solvent has a lower boiling point than the aromatic hydrocarbon solvent, so as to form a product solution of methylaluminoxane in said solvent mixture along with insoluble reaction products which can be removed by filtration. The aliphatic solvent can be removed by vaporization to give a concentrated solution of aluminoxane in the aromatic solvent.
Inventors
- 👤 Samuel A. Sangokoya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:51
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F5/068
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A process for preparing a methylaluminoxane comprising the steps of (i) reacting water with a solution of an alkylaluminum compound, wherein at least about half of the alkyl groups are methyl groups, in a 1:4 to 4:1 by volume aliphatic hydrocarbon/aromatic hydrocarbon solvent mixture, wherein the aliphatic hydrocarbon solvent has a lower boiling point than the aromatic hydrocarbon solvent, so as to form a product solution of methylaluminoxane in said solvent mixture along with unreacted alkylaluminum and insoluble reaction products and (ii) separating said insoluble reaction products from said product solution.
Claim 2
Dependent Claim
91 words
A process for preparing a methylaluminoxane comprising the steps of (i) reacting water with a solution of an alkylaluminum compound, wherein at least about half of the alkyl groups are methyl groups, in a 1:4 to 4:1 by volume aliphatic hydrocarbon/aromatic hydrocarbon solvent mixture, wherein the aliphatic hydrocarbon solvent has a lower boiling point than the aromatic hydrocarbon solvent, so as to form a product solution of methylaluminoxane in said solvent mixture along with unreacted alkylaluminum and insoluble reaction products and (ii) separating said insoluble reaction products from said product solution.
Claim 3
Dependent Claim
18 words
A process according to claim 1 including the step of removing the aliphatic solvent from said product solution.
Claim 4
Dependent Claim
31 words
A process according to claim 1 including the step of removing the aliphatic solvent and at least a portion of the unreacted alkylaluminum compound and aromatic solvent from said product solution.
Claim 5
Dependent Claim
44 words
A process according to claim 3 including the steps of separating the removed aliphatic solvent from the removed alkylaluminum compound and removed aromatic solvent by fractional distillation and recycling the resulting solution of alkylaluminum compound in aromatic solvent to step (i) of claim 1.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the alkylaluminum compound is trimethylaluminum.
Claim 7
Dependent Claim
11 words
The process of claim 2 wherein the alkylaluminum compound is trimethylaluminum.
Claim 8
Dependent Claim
11 words
The process of claim 4 wherein the alkylaluminum compound is trimethylaluminum.
Claim 9
Dependent Claim
28 words
The process of claim 3 wherein the boiling point of the aliphatic solvent is at least about 10° C. lower than the boiling point of said aromatic solvent.
Claim 10
Dependent Claim
27 words
The process of claim 8 wherein the aromatic solvent has from about 6 to 20 carbons and the aliphatic solvent has from about 5 to 7 carbons.
Claim 11
Dependent Claim
37 words
The process of claim 1 including the step of removing all of the solvent from the product solution following the separation of the insoluble reaction products so as to provide a solid, organic solvent soluble methylaluminoxane product.
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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) | 1996-09-27 | 1997-03-29 | 1997-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-27 | 2001-03-29 | 2001-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-27 | 2005-03-29 | 2005-09-28 | $7700.00 | Window Closed / Lapsed |