Patent US4297461A successfully refreshed from Google Patents.
US4297461A
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Olefin polymerization catalyst
Assignee: Equistar Chemicals LP
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Filing: 1980-04-17
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Granted: 1981-10-27
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Expires: 2000-04-17
Abstract
Abstract Olefin polymerization catalysts are prepared by depositing an organophosphoryl chromium product and a non-volatile aluminum-containing product obtained from the reaction of an aluminum alkoxide and an aluminum salt of a lower aliphatic monocarboxylic acid on an inorganic support material and heating the support material in a non-reducing atmosphere at a temperature above about 300° C. up to the decomposition temperature of the support material.
Inventors
- 👤 Anthony N. Speca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:42
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A process for polymerizing an olefin which comprises contacting the olefin with a catalyst system produced by a process which comprises: (a) depositing an organophosphoryl chromium reaction product of chromium trioxide and phosphorus compound having the formula ##STR2## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen but at least one R is other than hydrogen, upon a solid inorganic support material; (b) depositing the non-volatile aluminum-containing product obtained from the reaction of an aluminum alkoxide and an aluminum carboxylic acid salt upon said support material; and, (c) heat-activating said supported organophosphoryl chromium reaction product and non-volatile aluminum-containing reaction product in a non-reducing atmosphere at a temperature above about 300° C. up to the decomposition temperature of the support material.
Claim 2
Dependent Claim
120 words
A process for polymerizing an olefin which comprises contacting the olefin with a catalyst system produced by a process which comprises: (a) depositing an organophosphoryl chromium reaction product of chromium trioxide and phosphorus compound having the formula ##STR2## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen but at least one R is other than hydrogen, upon a solid inorganic support material; (b) depositing the non-volatile aluminum-containing product obtained from the reaction of an aluminum alkoxide and an aluminum carboxylic acid salt upon said support material; and, (c) heat-activating said supported organophosphoryl chromium reaction product and non-volatile aluminum-containing reaction product in a non-reducing atmosphere at a temperature above about 300° C. up to the decomposition temperature of the support material.
Claim 3
Dependent Claim
83 words
The process of claim 1 wherein the non-volatile aluminum-containing reaction product is first deposited upon the support material and the thus treated support is heat activated in a non-reducing atmosphere at a temperature of at least about 130° C. up to the decomposition temperature of the support, and the organophosphoryl chromium reaction product is thereafter deposited upon the support and the thus treated support is again heat-activated but at a temperatue above about 300° C. up to the decomposition temperatue of the support.
Claim 4
Dependent Claim
20 words
The process of claim 1 or 2 wherein a metallic and/or non-metallic reducing agent is added to the heat-activated catalyst.
Claim 5
Dependent Claim
17 words
The process of claim 1 or 2 wherein the hydrogen gas is present in the reaction medium.
Claim 6
Dependent Claim
12 words
The process of claim 1 or 2 wherein the olefin is ethylene.
Claim 7
Dependent Claim
10 words
The process of claim 3 wherein the olefin is ethylene.
Claim 8
Dependent Claim
10 words
The process of claim 4 wherein the olefin is ethylene.
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |