Patent US3081958A successfully refreshed from Google Patents.
Patent US4252926A successfully refreshed from Google Patents.
US4252926A
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US
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Process for polymerizing olefins and polymerization catalysts used therefor
Assignee: Equistar Chemicals LP
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Filing: 1978-08-07
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Granted: 1981-02-24
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Expires: 1998-08-07
Abstract
Abstract Olefins are polymerized in the presence of catalysts prepared by combining a heat activated supported organophosphoryl chromium compound with an alkyl borane which has been pretreated with hydrogen.
Inventors
- 👤 Stanley J. Katzen
- 👤 Louis J. Rekers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:05
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A process for the polymerization of an olefin which comprises contacting the olefin with a catalyst system obtained by heat activating a supported organophosphoryl chromium compound obtained by the reaction of chromium trioxide with an organophosphorus compound having the formula: ##STR3## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen, but at least one R is other than hydrogen, and combining the heat activated supported material with a hydrogenated alkyl borane prepared by reacting an alkyl borane in a solvent therefor with hydrogen gas at temperatures of from about 90° C. to about 130° C. and at pressures ranging from ambient to about 1000 p.s.i. with or without a hydrogenation catalyst for a period of time from about 5 minutes up to 8 hours.
Claim 2
Dependent Claim
124 words
A process for the polymerization of an olefin which comprises contacting the olefin with a catalyst system obtained by heat activating a supported organophosphoryl chromium compound obtained by the reaction of chromium trioxide with an organophosphorus compound having the formula: ##STR3## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen, but at least one R is other than hydrogen, and combining the heat activated supported material with a hydrogenated alkyl borane prepared by reacting an alkyl borane in a solvent therefor with hydrogen gas at temperatures of from about 90° C. to about 130° C. and at pressures ranging from ambient to about 1000 p.s.i. with or without a hydrogenation catalyst for a period of time from about 5 minutes up to 8 hours.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the catalyst system is supported upon silica gel.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the catalyst system is supported upon alumina.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein the olefin is ethylene.
Claim 6
Dependent Claim
44 words
The process of claim 1 wherein triethyl borane is pretreated with hydrogen at temperatures of from about 90° C. to about 130° C. at pressures ranging from ambient to about 1,000 p.s.i. and for periods of from about 15 minutes to about 8 hours.
Claim 7
Dependent Claim
22 words
The process of claim 5 wherein the pretreatment of triethyl borane with hydrogen takes place in the presence of a hydrogenation catalyst.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the catalyst system additionally contains an organoaluminum compound prior to heat activation.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein the organoaluminum compound and the organophosphoryl chromium compound are subjected to separate heat activation operations.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein said polymerization is conducted in the presence of hydrogen.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |