US4544762A
Expired / Lapsed
US
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Process for the preparation of oligomeric aluminoxanes
Assignee: Hoechst AG
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Filing: 1983-10-31
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Granted: 1985-10-01
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Expires: 2003-10-31
Abstract
Abstract The present invention relates to a process for the preparation of oligomeric alkylaluminoxanes of the general formulae: ##STR1## in which R=C 1 -C 6 -alkyl, preferably methyl, and n=2-40, preferably 10-20, by reacting aluminum salts containing water of crystallization, preferably aluminum sulfate containing water of crystallization, with an aluminum trialkyl, preferably aluminum trimethyl. Aluminoxanes of this type can be used as a catalyst component in the preparation of high-activity, homogeneous Ziegler catalysts.
Inventors
- 👤 Walter Kaminsky
- 👤 Heinrich Hahnsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:32
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/10; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/066; C07F5/068; C08F; C08F10/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
A process for the preparation of oligomeric, linear and/or cyclic alkylaluminoxanes of the formulae: ##STR7## in which n=2 to 40 and R=C 1 -C 6 -alkyl, which comprises reacting, with the elimination of an alkane, an aluminum trialkyl dissolved in an inert aliphatic or aromatic solvent at temperatures between -20° and 100° C. with an aluminum salt containing water of crystallization.
Claim 2
Dependent Claim
61 words
A process for the preparation of oligomeric, linear and/or cyclic alkylaluminoxanes of the formulae: ##STR7## in which n=2 to 40 and R=C 1 -C 6 -alkyl, which comprises reacting, with the elimination of an alkane, an aluminum trialkyl dissolved in an inert aliphatic or aromatic solvent at temperatures between -20° and 100° C. with an aluminum salt containing water of crystallization.
Claim 3
Dependent Claim
16 words
The process as claimed in claim 1, wherein toluene or heptane is used as the solvent.
Claim 4
Dependent Claim
20 words
The process as claimed in claim 1, wherein the reaction is carried out at temperatures between 15° and 40° C.
Claim 5
Dependent Claim
16 words
The process as claimed in claim 1, wherein aluminum trimethyl is employed as the aluminum trialkyl.
Claim 6
Dependent Claim
18 words
The process as claimed in claim 1, wherein 1 to 30% strength solutions of aluminum trimethyl are used.
Claim 7
Dependent Claim
18 words
The process as claimed in claim 1, wherein 5 to 20% strength solutions of aluminum trimethyl are used.
Claim 8
Dependent Claim
20 words
The process as claimed in claim 1, wherein aluminum sulfate is used as the aluminum salt containing water of crystallization.
Claim 9
Dependent Claim
30 words
The process as claimed in claim 1, wherein hydrated aluminum sulfates containing 9 to 18 molecules of water of crystallization are used as the aluminum salt containing water of crystallization.
Claim 10
Dependent Claim
37 words
The process as claimed in claim 1, wherein Al 2 (SO 4 ) 3 .18H 2 O or Al 2 (SO 4 ) 3 .16H 2 O is used as the aluminum salt containing water of crystallization.
Claim 11
Dependent Claim
45 words
The process as claimed in claim 1, wherein aluminum trimethyl is used as the aluminum trialkyl and hydrated aluminum sulfate is used as the aluminum salt containing water of crystallization, and the molar ratio between aluminum trimethyl and hydrated aluminum sulfate is 2 to 18.
Claim 12
Dependent Claim
43 words
The process as claimed in claim 1, wherein aluminum trimethyl is used as the aluminum trialkyl and hydrated aluminum sulfate is used as the aluminum salt containing water of crystallization, and the molar ratio between aluminum trimethyl and hydrated aluminum sulfate is 9.
Claim 13
Dependent Claim
37 words
The process as claimed in claim 1, wherein aluminum trimethyl is employed as the aluminum trialkyl, and the reaction mixture is filtered and the filtrate is worked up to give solid methyl aluminoxane by removing the solvent.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |