US5595950A
Expired / Lapsed
US
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Polymerization catalyst systems, their production and use
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1995-11-08
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Granted: 1997-01-21
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Expires: 2015-11-08
Abstract
Abstract This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst of the invention provides for a supported bulky ligand transition metal catalyst which when utilized in a polymerization process substantially reduces the reactor fouling and sheeting particularly in a gas phase polymerization process.
Inventors
- 👤 Vispi R. Sagar
- 👤 Moses O. Jejelowo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:04
CPC Classifications
C; C08; C08F; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/639; C08F4/63912; C08F4/63916; C08F4/6392; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A method for producing a supported catalyst system, said method comprising the steps of: (1) contacting a porous carrier with at least one metallocene; and (2) adding alumoxane that, after its initial formation, has been hydrolyzed with a hydrolyzing agent without the prior addition of alkylaluminum.
Claim 2
Independent Claim
46 words
A method for producing a supported catalyst system, said method comprising the steps of: (1) contacting a porous carrier with at least one metallocene; and (2) adding alumoxane that, after its initial formation, has been hydrolyzed with a hydrolyzing agent without the prior addition of alkylaluminum.
Claim 3
Dependent Claim
82 words
The method of claim 1 wherein the alumoxane has been hydrolyzed in an amount such that the following equation is satisfied: HA/OM is equal to about 1.5 (A-0.08) wherein A is the molar ratio of alkylaluminum from which the alumoxane is initially formed to the total metal content of the alumoxane initially formed which would include unreacted alkylaluminum; HA is the number of moles of hydrolyzing agent and OM is the number of moles of alkylaluminum remaining after initial formation of alumoxane.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein the alumoxane is methylalumoxane.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein the hydrolyzing agent is water.
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) | 2000-01-21 | 2000-07-22 | 2001-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-21 | 2004-07-22 | 2005-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-21 | 2008-07-22 | 2009-01-21 | $7700.00 | Window Closed / Lapsed |