US5006500A
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Olefin polymerization catalyst from trialkylaluminum mixture, silica gel and a metallocene
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1989-10-16
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Granted: 1991-04-09
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Expires: 2009-10-16
Abstract
Abstract A high activity alumoxane-metallocene supported catalyst for the polymerization of 1-olefins prepared by reacting undehydrated silica gel with a mixture of trimethylaluminum and triisobutylaluminum to produce a silica-alumoxane product which is then reacted with a Group IVB and/or Group VB metallocene to produce an active catalyst which may be obtained in powder form, suitable for use in gas or slurry phase reactors, by a removal of solvents and drying.
Inventors
- 👤 Main Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:38
CPC Classifications
C; C08; C08F; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/65916; C08F4/6592; G; G03; G03B; G03B2227/00; G03B2227/32; G03B2227/325; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A catalyst for the polymerization of 1-olefins comprising the reaction product of: (a) undehydrated silica gel; (b) a mixture of trimethyl aluminum and triisobutyl aluminum wherein the mole ratio of TMA to TIBA is from about 2:1 to about 1000:1; and (c) a metallocene component selected from the group consisting of Group IVB metallocenes, Group VB metallocenes and mixtures thereof.
Claim 2
Dependent Claim
60 words
A catalyst for the polymerization of 1-olefins comprising the reaction product of: (a) undehydrated silica gel; (b) a mixture of trimethyl aluminum and triisobutyl aluminum wherein the mole ratio of TMA to TIBA is from about 2:1 to about 1000:1; and (c) a metallocene component selected from the group consisting of Group IVB metallocenes, Group VB metallocenes and mixtures thereof.
Claim 3
Dependent Claim
16 words
The catalyst of claim 1 wherein the metallocene is a titanocene, zirconocene, hafnocene or mixtures thereof.
Claim 4
Dependent Claim
33 words
The catalyst of claim 1 wherein the water content of the undehydrated silica gel ranges from about 6 to about 20 wt. % based on the total weight of silica gel and water.
Claim 5
Dependent Claim
46 words
The catalyst of claim 1 wherein the metallocene is a titanocene, hafnocene, zirconocene, or mixtures thereof and the moisture content of the undehydrated silica is from about 6 wt. % to about 20 wt. % based on the total weight of the silica gel and water.
Claim 6
Independent Claim
76 words
A method of preparing a catalyst active for the polymerization of 1-olefins, comprising: (i) reacting a mixture of triisobutyl aluminum and trimethyl aluminum wherein the mole ratio of TMA to TIBA is from about 2:1 to 1000:1 with an undehydrated silica gel to form a reaction product; (ii) contacting the reaction product with a metallocene component selected from the group consisting of Group IVB metallocenes, Group VB metallocenes and mixtures thereof to produce a catalytic composition.
Claim 7
Independent Claim
76 words
A method of preparing a catalyst active for the polymerization of 1-olefins, comprising: (i) reacting a mixture of triisobutyl aluminum and trimethyl aluminum wherein the mole ratio of TMA to TIBA is from about 2:1 to 1000:1 with an undehydrated silica gel to form a reaction product; (ii) contacting the reaction product with a metallocene component selected from the group consisting of Group IVB metallocenes, Group VB metallocenes and mixtures thereof to produce a catalytic composition.
Claim 8
Dependent Claim
21 words
The method of claim 5 further comprising removing solvents and drying the catalytic composition to produce a catalyst in powder form.
Claim 9
Dependent Claim
16 words
The method of claim 5 wherein the metallocene is a titanocene, zirconocene, hafnocene or mixtures thereof.
Claim 10
Dependent Claim
33 words
The method of claim 5 wherein the water content of the undehydrated silica gel ranges from about 6 to about 20 wt. % based on the total weight of silica gel and water.
Claim 11
Dependent Claim
46 words
The method of claim 5 wherein the metallocene is a titanocene, hafnocene, zirconocene, or mixtures thereof and the moisture content of the undehydrated silica is from about 6 wt. % to about 20 wt. % based on the total weight of the silica gel and water.
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