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US5593931A
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Cyclopentadienyl group 6b metal alpha-olefin polymerization catalysts and process for polymerizing alpha-olefins
Assignee: Chevron Phillips Chemical Co LP
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Filing: 1995-03-03
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Granted: 1997-01-14
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Expires: 2015-03-03
Abstract
Abstract Disclosed is a catalyst system for the homopolymerization of alpha-olefins having 2-8 carbon atoms, said catalyst system comprising a mixed-valent dimeric Group 6b metal compound catalyst precursor wherein one atom of said Group 6b metal is a cyclopentadienyl Group 6b metal hydrocarbyl complex in which the Group 6b metal has an oxidation state +3 and wherein one atom of said Group 6b metal is a cyclopentadienyl alkaryl complex in which the Group 6b metal has an oxidation state +1, said dimeric Group 6b metal compound being supported on an inorganic support. The catalyst system can contain, in addition, a Group 2 or Group 3 metal-alkyl compound.
Inventors
- 👤 David L. Beach
- 👤 Michael J. Carney
- 👤 Javier M. Mora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:22
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
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
90 words
A catalyst system for the homopolymerization of alpha-olefins having from 2-8 carbon atoms, said catalyst system comprising a mixed-valent dimeric Group 6b metal compound catalyst precursor wherein one atom of said Group 6b metal is a cyclopentadienyl Group 6b metal hydrocarbyl complex in which the Group 6b metal has an oxidation state +3 and wherein one atom of said Group 6b metal is a cyclopentadienyl alkaryl complex in which the Group 6b metal has an oxidation state +1, said dimeric Group 6b metal compound being supported on an inorganic support.
Claim 2
Dependent Claim
90 words
A catalyst system for the homopolymerization of alpha-olefins having from 2-8 carbon atoms, said catalyst system comprising a mixed-valent dimeric Group 6b metal compound catalyst precursor wherein one atom of said Group 6b metal is a cyclopentadienyl Group 6b metal hydrocarbyl complex in which the Group 6b metal has an oxidation state +3 and wherein one atom of said Group 6b metal is a cyclopentadienyl alkaryl complex in which the Group 6b metal has an oxidation state +1, said dimeric Group 6b metal compound being supported on an inorganic support.
Claim 3
Dependent Claim
13 words
The catalyst system of claim 1 wherein the Group 6b metal is chromium.
Claim 4
Dependent Claim
84 words
The catalyst system of claim 1 wherein the Group 6b metal compound has the formula: ##STR5## wherein M is a Group 6b metal such as chromium, molybdenum and tungsten; (C 5 (R') 5 ) is a cyclopentadienyl ring, R' is at each independent occurrence hydrogen, a hydrocarbyl radical having 1-20 carbon atoms, or adjacent R' groups may together form one or more hydrocarbyl rings; X is a hydrocarbyl radical having 1-20 carbon atoms; and X' is an alkaryl radical having from 7-20 carbon atoms.
Claim 5
Dependent Claim
29 words
A catalyst system according to claim 3 wherein M is chromium; X is an alkaryl radical having from 7-20 carbon atoms and (C 5 (R') 5 ) is pentamethylcyclopentadienyl.
Claim 6
Dependent Claim
13 words
A catalyst system according to claim 4 wherein X and X' are benzyl.
Claim 7
Dependent Claim
15 words
A catalyst system according to claim 3 wherein X is methyl and X' is benzyl.
Claim 8
Dependent Claim
18 words
The catalyst system of claim 5 wherein the support is an inorganic metal oxide or inorganic metal phosphate.
Claim 9
Dependent Claim
13 words
The catalyst system of claim 7 wherein the support is an aluminum phosphate.
Claim 10
Dependent Claim
18 words
The catalyst system of claim 1 which contains in addition a Group 2 or 3 metal alkyl compound.
Claim 11
Dependent Claim
13 words
The catalyst system of claim 9 wherein the Group 6b metal is chromium.
Claim 12
Dependent Claim
20 words
The catalyst system of claim 10 wherein the cyclopentadienyl Group 6b metal hydrocarbyl complex: is a cyclopentadienyl chromium alkaryl complex.
Claim 13
Dependent Claim
14 words
The catalyst system of claim 11 wherein each alkaryl group is a benzyl group.
Claim 14
Dependent Claim
18 words
The catalyst system of claim 3 which contains in addition a Group 2 or 3 metal alkyl compound.
Claim 15
Dependent Claim
25 words
The catalyst system of claim 13 wherein X is alkaryl, M is chromium and the Group 2 or 3 metal is an aluminum alkyl compound.
Claim 16
Dependent Claim
20 words
The catalyst system of claim 14 wherein X and X' are benzyl and the inorganic oxide support is aluminum phosphate.
Claim 17
Dependent Claim
28 words
The catalyst system of claim 15 wherein the alkyl aluminum compound is selected from the group consisting of trialkylaluminum compounds, alkyl aluminum alkoxides, alkyl aluminum halides and aluminoxanes.
Claim 18
Dependent Claim
14 words
The catalyst system of claim 16 wherein the alkyl aluminum compound is an aluminoxane.
Claim 19
Dependent Claim
36 words
A process for the polymerization of an alpha-olefin having from 2-8 carbon atoms which comprises contacting said alpha-olefin under polymerization reaction conditions in the contact presence of a catalyst system according to any of claims 1-17.
Claim 20
Dependent Claim
11 words
A process according to claim 18 wherein the alpha-olefin is ethylene.
Claim 21
Dependent Claim
17 words
A process according to claim 19 wherein the process is operated in the added presence of hydrogen.
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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) | 2000-01-14 | 2000-07-15 | 2001-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-14 | 2004-07-15 | 2005-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-14 | 2008-07-15 | 2009-01-14 | $7700.00 | Window Closed / Lapsed |