Patent US4952714A successfully refreshed from Google Patents.
US4952714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-aqueous process for the preparation of alumoxanes
Assignee: ExxonMobil Chemical Patents Inc
•
Filing: 1989-08-08
•
Granted: 1990-08-28
•
Expires: 2009-08-08
Abstract
Abstract A process for the preparation of hydrocarbylalumoxanes comprising oligomeric, linear and/or cyclic hydrocarbylalumoxanes which comprise contacting a hydrocarbylaluminum dissolved in an inert dry organic liquid with a trihydrocarbylboroxine. Preferably, the trihydrocarbylboroxine is prepared by the reaction of boron oxide with trihydrocarbylborane.
Inventors
- 👤 Howard C. Welborn, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:13
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: 7
Claim 1
Independent Claim
31 words
A process for the preparation of a mixture of linear and cyclic hydrocarbylalumoxane which comprises adding a hydrocarbon solution containing trihydrocarbylboroxine to a hydrocarbon solution containing hydrocarbylaluminum and recovering the alumoxane.
Claim 2
Dependent Claim
31 words
A process for the preparation of a mixture of linear and cyclic hydrocarbylalumoxane which comprises adding a hydrocarbon solution containing trihydrocarbylboroxine to a hydrocarbon solution containing hydrocarbylaluminum and recovering the alumoxane.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein the molar ratio of trihydrocarbylboroxine to hydrocarbylaluminum is about 1:3.05 to about 1:4.
Claim 4
Dependent Claim
10 words
The process of claim 1, wherein the hydrocarbylaluminum is trialkylaluminum.
Claim 5
Dependent Claim
10 words
The process of claim 3, wherein the trialkylaluminum is trimethylaluminum.
Claim 6
Dependent Claim
20 words
The process of claim 1, wherein the hydrocarbon solution is selected from the group consisting of toluene, hexane, and heptane.
Claim 7
Dependent Claim
12 words
The process of claim 1, wherein the trihydrocarbylboroxine is trimethylboroxine or triethylboroxine.
References Cited (Backward Citations)
US3049407A
Cited
US4665208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |