US5086024A
Expired / Lapsed
US
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Catalyst system for polymerization of olefins
Assignee: Texas Alkyls Inc
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Filing: 1990-08-01
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Granted: 1992-02-04
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Expires: 2010-08-01
Abstract
Abstract A catalyst system for the polymerization of olefins is disclosed which comprises a metallocene component, for example, organometallic coordination compounds of a Group IVB or Group VB hydrolysis products comprising methane and C2 or higher alkanes, such as isobutane, n-butane or n-hexane.
Inventors
- 👤 Clark C. Crapo
- 👤 Dennis B. Malpass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:16
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: 16
Claim 1
Independent Claim
30 words
A catalyst system for the polymerization of olefins which comprises a metallocene component and a methylaluminoxane which, when hydrolyzed, evolves hydrolysis products comprising methane and C 2 or higher alkanes.
Claim 2
Dependent Claim
30 words
A catalyst system for the polymerization of olefins which comprises a metallocene component and a methylaluminoxane which, when hydrolyzed, evolves hydrolysis products comprising methane and C 2 or higher alkanes.
Claim 3
Dependent Claim
25 words
A catalyst system as claimed in claim 1 wherein the metallocene component comprises an organometallic coordination compound of a Group IVB or Group VB metal.
Claim 4
Dependent Claim
17 words
A catalyst system as claimed in claim 2 wherein the organometallic coordination compound comprises a zirconium compound.
Claim 5
Dependent Claim
28 words
A catalyst system 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 6
Dependent Claim
24 words
A catalyst system as claimed in claim 1 wherein the methane content from the hydrolysis ranges from about 20% to about 80%, by weight.
Claim 7
Dependent Claim
48 words
A catalyst system as claimed in claim 2 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 8
Dependent Claim
35 words
A catalyst system as claimed in claim 1 wherein methylaluminoxane is 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 9
Dependent Claim
41 words
A catalyst system as claimed in claim 7 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 10
Dependent Claim
15 words
A catalyst system as claimed in claim 7 wherein the alkyl groups are isobutyl groups.
Claim 11
Dependent Claim
38 words
A catalyst system as claimed in claim 1 wherein the methylaluminoxane is 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
15 words
A catalyst system as claimed in claim 10 wherein the alkyl groups are isobutyl groups.
Claim 13
Dependent Claim
32 words
A catalyst system as claimed in claim 1 wherein the methylaluminoxane is formed by the reaction of a polyalkylaluminoxane containing C 2 or higher alkyl groups with trimethylaluminum and then with water.
Claim 14
Dependent Claim
15 words
A catalyst system as claimed in claim 12 wherein the alkyl groups are isobutyl groups.
Claim 15
Dependent Claim
34 words
A catalyst system 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.
Claim 16
Dependent Claim
34 words
A catalyst system as claimed in claim 14 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) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |