Patent US3694422A successfully refreshed from Google Patents.
US3694422A
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Light activation of tetraalkylchromium compounds in polymerization of olefins
Assignee: Himont Inc
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Filing: 1971-02-02
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Granted: 1972-09-26
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Expires: 1991-02-02
Abstract
Abstract The activity of tetraalkylchromium compounds as catalysts for the polymerization of 1-olefins is greatly enhanced by exposure of the catalyst, either prior to or during the polymerization, to light. Any source of light having a wave length of from about 280 to 600 nanometers can be used. Organometallic activators such as triethylboron or alkylaluminum compounds can be used to further activate these catalysts.
Inventors
- 👤 Wendell P Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:34
CPC Classifications
C; C07; C07F; C07F11/00; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
30 words
The process of claim 1 wherein the catalyst is further activated by the addition of an organometallic activator selected from the group consisting of an organoaluminum compound and a trihydrocarbonboron.
Claim 2
Dependent Claim
9 words
The process of claim 1 wherein ethylene is polymerized.
Claim 3
Dependent Claim
9 words
The process of claim 1 wherein propylene is polymerized.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the process is carried out in solution in a hydrocarbon solvent free of ethylenic unsaturation.
Claim 5
Dependent Claim
19 words
The process of claim 5 wherein the tetraalkylchromium compound is irradiated with light in the presence of the 1-olefin.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the tetraalkyl-chromium is extended on an oxidic carrier material.
Claim 7
Dependent Claim
11 words
The process of claim 7 wherein the carrier material is silica.
Claim 8
Dependent Claim
22 words
The process of claim 8 wherein the tetraalkylchromium extended on silica is irradiated with light prior to use in the polymerization process.
Claim 9
Dependent Claim
21 words
The process of claim 8 wherein the tetraalkylchromium extended on silica is irradiated with light in the presence of the 1-olefin.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |