Patent US4960878A successfully refreshed from Google Patents.
US4960878A
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US
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Synthesis of methylaluminoxanes
Assignee: Texas Alkyls Inc
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Filing: 1988-12-02
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Granted: 1990-10-02
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Expires: 2008-12-02
Abstract
Abstract Methylaluminoxane can be formed by the reaction of a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with trimethylaluminum with the trimethylaluminum being present in an amount which is not present in stoichiometric excess. Another embodiment of the present invention involves the synthesis of the methylaluminoxane by reaction of a trialkylaluminum compound or a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with water to form a polyalkylaluminoxane which is then reacted with trimethylaluminum. A third embodiment of the present invention involves the synthesis of the methylaluminoxane by reaction of the aforementioned polyalkylaluminoxane with trimethylaluminum and then with water.
Inventors
- 👤 Clark C. Crapo
- 👤 Dennis B. Malpass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:01
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F5/068
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
31 words
A process for the synthesis of methylaluminoxane which comprises reaction of a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with an amount of trimethylaluminum that is not in stoichiometric excess.
Claim 2
Dependent Claim
31 words
A process for the synthesis of methylaluminoxane which comprises reaction of a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with an amount of trimethylaluminum that is not in stoichiometric excess.
Claim 3
Dependent Claim
14 words
A process as claimed in claim 1 wherein the alkyl groups are isobutyl groups.
Claim 4
Dependent Claim
44 words
A process as claimed in any of claims 1 to 2 where the molar amount of tetraalkyldialuminoxane to trimethylaluminum ranges from about 0.1:1 to no more than 1:1 and the reaction is conducted at temperatures ranging from about -10° C. to about 150° C.
Claim 5
Dependent Claim
33 words
A process for the sYnthesis of methylaluminoxane which comprises the reaction of a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with water to form a polyalkylaluminoxane which is then reacted with trimethylaluminum.
Claim 6
Dependent Claim
33 words
A process for the sYnthesis of methylaluminoxane which comprises the reaction of a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with water to form a polyalkylaluminoxane which is then reacted with trimethylaluminum.
Claim 7
Dependent Claim
34 words
A process for the synthesis of methylaluminoxane which comprises the reaction of a trialkylaluminum compound containing C 2 or higher alkyl groups with water to form a polyalkylaluminoxane which is then reacted with trimethylaluminum.
Claim 8
Dependent Claim
34 words
A process for the synthesis of methylaluminoxane which comprises the reaction of a trialkylaluminum compound containing C 2 or higher alkyl groups with water to form a polyalkylaluminoxane which is then reacted with trimethylaluminum.
Claim 9
Dependent Claim
17 words
A process as claimed in either claim 4 or 5 wherein the alkyl groups are isobutyl groups.
Claim 10
Dependent Claim
35 words
A process as claimed in any of claims 4-6 wherein the molar ratio of trimethylaluminum to polyalkylaluminoxane ranges from about 0.1 to about 10 at temperatures of from about -20° C. to about 50° C.
Claim 11
Dependent Claim
26 words
A process for the synthesis of methylaluminoxane which comprises reaction of a polyalkylaluminoxane containing C 2 or higher alkyl groups with trimethylaluminum and then with water.
Claim 12
Dependent Claim
26 words
A process for the synthesis of methylaluminoxane which comprises reaction of a polyalkylaluminoxane containing C 2 or higher alkyl groups with trimethylaluminum and then with water.
Claim 13
Dependent Claim
14 words
A process as claimed in claim 8 wherein the alkyl groups are isobutyl groups.
Claim 14
Dependent Claim
35 words
A process as claimed in any of claims 8-9 wherein the molar ratio of trimethylaluminum to polyalkylaluminoxane ranges from about 0.1 to about 10 at temperatures of from about -20° C. to about 50° C.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |