Patent US3711220A successfully refreshed from Google Patents.
Patent US4029875A successfully refreshed from Google Patents.
US4029875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radical polymerization of ethylene in the presence of cyclic olefin
Assignee: Norsolor SA
•
Filing: 1976-04-21
•
Granted: 1977-06-14
•
Expires: 1996-04-21
Abstract
Abstract Radical polymerization of ethylene in the presence of an initiator and up to 500 ppm of a cyclic olefin having from 5 to 12 carbon atoms and a ring of 5 to 9 members or styrene and its alkyl homologues.
Inventors
- 👤 Pierre Gloriod
- 👤 Jean Pierre Machon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:08
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
In a process for the radical polymerization of ethylene in a stirred autoclave reactor in a reaction medium at temperatures above 220° C and under pressures above 1000 bars in the presence of oxygen, peroxides or peresters as initiators, the improvement comprising injecting into the reaction medium, at the same time as the initiator up to 500 ppm based on the weight of the ethylene of an additive compound selected from the group consisting of cyclic olefins having from 5 to 12 carbon atoms and a ring of 5 to 9 members and styrene and its homologues bearing alkyl substituents on the benzene nucleus.
Claim 2
Dependent Claim
104 words
In a process for the radical polymerization of ethylene in a stirred autoclave reactor in a reaction medium at temperatures above 220° C and under pressures above 1000 bars in the presence of oxygen, peroxides or peresters as initiators, the improvement comprising injecting into the reaction medium, at the same time as the initiator up to 500 ppm based on the weight of the ethylene of an additive compound selected from the group consisting of cyclic olefins having from 5 to 12 carbon atoms and a ring of 5 to 9 members and styrene and its homologues bearing alkyl substituents on the benzene nucleus.
Claim 3
Dependent Claim
81 words
In a process for the radical polymerization of ethylene in a stirred autoclave reactor in a reaction medium at temperatures above 220° C and under pressures above 1000 bars in the presence of oxygen, peroxides or peresters as initiators, the improvement comprising injecting into the reaction medium, at the same time as the initiator up to 500 ppm based on the weight of the ethylene of an additive compound selected from the group consisting of cyclopentene, cyclohexene, alpha-pinene, cycloheptene, and cyclooctene.
Claim 4
Dependent Claim
81 words
In a process for the radical polymerization of ethylene in a stirred autoclave reactor in a reaction medium at temperatures above 220° C and under pressures above 1000 bars in the presence of oxygen, peroxides or peresters as initiators, the improvement comprising injecting into the reaction medium, at the same time as the initiator up to 500 ppm based on the weight of the ethylene of an additive compound selected from the group consisting of cyclopentene, cyclohexene, alpha-pinene, cycloheptene, and cyclooctene.
Claim 5
Dependent Claim
12 words
The process according to claim 2, in which the additive is cyclohexene.
Claim 6
Dependent Claim
12 words
The process according to claim 1, in which the additive is styrene.
Claim 7
Dependent Claim
22 words
The process according to claim 1, in which the additive is injected into the reaction medium at a temperature above 180° C.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |