Patent US3923767A successfully refreshed from Google Patents.
US3923767A
Expired / Lapsed
US
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Ethylene polymerization process in the presence of quinone alkides
Assignee: Gulf Research and Development Co
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Filing: 1974-08-22
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Granted: 1975-12-02
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Expires: 1994-08-22
Abstract
Abstract A process for polymerizing ethylene is provided in which very small concentrations of a quinone alkide, such as 3,5ditertiarybutyl-p-quinone methide, are employed in the reaction medium. The quinone alkide modifies the properties of the resulting polymers, particularly by providing both improved strength and optical properties.
Inventors
- 👤 Gene E Kellum
- 👤 Ronald E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:10
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02; C07; C07C; C07C45/00; C07C45/27; C07C45/29; C07C45/296; C07C45/51; C07C45/511; C07C45/512; C07C49/00; C07C49/587; C07C49/647; C07C49/687
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
49 words
IN A CONTINUOUS HIGH PRESSURE, FREE-RADICAL INITIATED, MASS PROCESS FOR PREPARING ETHYLENE POLYMERS, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY OF FEEDING A QUINONE ALKIDE TO THE POLYMERIZATION ZONE IN A MINOR AMOUNT SUFFICIENT TO IMPROVE THE OPTICAL PROPERTIES OF THE ETHYLENE POLYMER BEING PRODUCED, SAID QUINONE ALKIDE HAVING THE FORMULA:
Claim 2
Dependent Claim
49 words
IN A CONTINUOUS HIGH PRESSURE, FREE-RADICAL INITIATED, MASS PROCESS FOR PREPARING ETHYLENE POLYMERS, THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY OF FEEDING A QUINONE ALKIDE TO THE POLYMERIZATION ZONE IN A MINOR AMOUNT SUFFICIENT TO IMPROVE THE OPTICAL PROPERTIES OF THE ETHYLENE POLYMER BEING PRODUCED, SAID QUINONE ALKIDE HAVING THE FORMULA:
Claim 3
Dependent Claim
13 words
The method of claim 1 in which the quinone alkide is 3,5-ditertiarybutyl-p-quinone methide.
Claim 4
Dependent Claim
13 words
The method of claim 1 in which the quinone alkide is 3,5-ditertiarybutyl-p-quinone ethide.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |