US3666743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of 1-olefins with tetrakis(bicycloheptyl)chromium compounds as catalysts
Assignee: Himont Inc
•
Filing: 1971-02-02
•
Granted: 1972-05-30
•
Expires: 1991-02-02
Abstract
Abstract Tetrakis(1-bicycloheptyl)chromium compounds are catalysts for the polymerization of 1-olefins when activated by the addition of an organometallic compound and/or exposure to light. The polymerization process can be carried out by using a solution of the chromium compound or by extending the chromium compound on a solid support such as silica.
Inventors
- 👤 Barton K Bower
- 👤 Wendell P Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:54
CPC Classifications
C; C07; C07F; C07F11/00; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
18 words
The process of claim 1 wherein the chromium compound is activated by a combination of (1) and (2).
Claim 2
Dependent Claim
13 words
The process of claim 1 wherein the organometallic activator is an organoaluminum compound.
Claim 3
Dependent Claim
21 words
The process of claim 2 wherein the process is carried out in solution in a hydrocarbon solvent free of ethylenic unsaturation.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the tetrakis(bicycloheptyl)chromium compound is extended on a solid support.
Claim 5
Dependent Claim
10 words
The process of claim 5 wherein the support is silica.
Claim 6
Dependent Claim
33 words
The process of claim 6 wherein the tetrakis(bicycloheptyl)chRomium compound extended on silica is irradiated with light prior to use in the polymerization process and is further activated by the addition of a trialkylaluminum.
Claim 7
Dependent Claim
22 words
The process of claim 6 wherein the tetrakis(bicycloheptyl)chromium compound extended on silica is irradiated with light in the presence of the 1-olefin.
Claim 8
Dependent Claim
16 words
The process of claim 4 wherein the chromium compound is tetrakis(1-norbornyl)chromium and the 1-olefin is ethylene.
Claim 9
Dependent Claim
16 words
The process of claim 8 wherein the chromium compound is tetrakis(1-norbornyl)chromium and the 1-olefin is ethylene.
Claim 10
Dependent Claim
11 words
The process of claim 9 wherein the organometallic activator is triethylaluminum.
Claim 11
Dependent Claim
12 words
The process of claim 9 wherein the organometallic activator is ethylaluminum dichloride.
Claim 12
Dependent Claim
9 words
The process of claim 10 wherein triethylaluminum is added.
Claim 13
Dependent Claim
9 words
The process of claim 10 wherein triethylboron is added.
Claim 14
Dependent Claim
18 words
A polymerization catalyst comprising a tetrakis(bicycloheptyl)chromium compound extended on a solid support, said chromium compound having the formula
Claim 15
Dependent Claim
17 words
The catalyst of claim 15 wherein the chromium compound is tetrakis(1-norbornyl)chromium and the solid support is silica.
Claim 16
Dependent Claim
26 words
The catalyst of claim 16 wherein the catalyst is activated by irradiation with light having a wave length of from about 280 to about 600 nanometers.
References Cited (Backward Citations)
US3257332A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |