Patent US5041584A successfully refreshed from Google Patents.
US5041584A
Expired / Lapsed
US
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Modified methylaluminoxane
Assignee: Texas Alkyls Inc
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Filing: 1990-08-01
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Granted: 1991-08-20
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Expires: 2010-08-01
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 with 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
2026-10-30 20:38
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F5/068; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
15 words
Methylaluminoxane which when hydrolyzed, evolves hydrolysis products comprising methane and C 2 or higher alkanes.
Claim 2
Dependent Claim
15 words
Methylaluminoxane which when hydrolyzed, evolves hydrolysis products comprising methane and C 2 or higher alkanes.
Claim 3
Dependent Claim
26 words
Methylaluminoxane as claimed in claim 1 wherein the C 2 or higher alkane hydrolysis product is selected from the group consisting of isobutane, n-butane, and n-hexane.
Claim 4
Dependent Claim
22 words
Methylaluminoxane as claimed in claim 1 wherein the methane content from the hydrolysis ranges from about 20% to about 80%, by weight.
Claim 5
Dependent Claim
46 words
Methylaluminoxane as claimed in claim 1 wherein the methane content from the hydrolysis ranges from about 20% to about 80%, by weight, and the C 2 or higher alkane hydrolysis product constitutes the remainder and is selected from the group consisting of isobutane, n-butane, and n-hexane.
Claim 6
Dependent Claim
25 words
Methlaluminoxane formed by reaction of a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with an amount of trimethylaluminum that is not in stoichiometric excess.
Claim 7
Dependent Claim
25 words
Methlaluminoxane formed by reaction of a tetraalkyldialuminoxane containing C 2 or higher alkyl groups with an amount of trimethylaluminum that is not in stoichiometric excess.
Claim 8
Dependent Claim
39 words
Methylaluminoxane as claimed in claim 5 wherein 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 9
Dependent Claim
13 words
Methylaluminoxane as claimed in claim 5 wherein the alkyl groups are isobutyl groups.
Claim 10
Dependent Claim
27 words
Methylaluminoxane formed by 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 11
Dependent Claim
27 words
Methylaluminoxane formed by 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 12
Dependent Claim
28 words
Methylaluminoxane formed by the reaction of a tetraalkylaluminum compound containing C 2 or higher alkyl groups with water to form a polyalkylaluminoxane which is then reacted with trimethylaluminum.
Claim 13
Dependent Claim
28 words
Methylaluminoxane formed by the reaction of a tetraalkylaluminum compound containing C 2 or higher alkyl groups with water to form a polyalkylaluminoxane which is then reacted with trimethylaluminum.
Claim 14
Dependent Claim
13 words
Methylaluminoxane as claimed in claim 8 wherein the alkyl groups are isobutyl groups.
Claim 15
Dependent Claim
13 words
Methylaluminoxane as claimed in claim 9 wherein the alkyl groups are isobutyl groups.
Claim 16
Dependent Claim
21 words
Methylaluminoxane formed by the reaction of a polyalkylaluminoxane containing C 2 or higher alkyl groups with trimethylaluminum and then with water.
Claim 17
Dependent Claim
21 words
Methylaluminoxane formed by the reaction of a polyalkylaluminoxane containing C 2 or higher alkyl groups with trimethylaluminum and then with water.
Claim 18
Dependent Claim
13 words
Methylaluminoxane as claimed in claim 12 wherein the alkyl groups are isobutyl groups.
Claim 19
Dependent Claim
32 words
Methylaluminoxane as claimed in claim 12 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 20
Dependent Claim
32 words
Methylaluminoxane as claimed in claim 13 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.
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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) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |