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Patent US4251340A successfully refreshed from Google Patents.
US4251340A
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Terpolymerization of ethylene, sulfur dioxide and carbon monoxide
Assignee: United States Department of Energy
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Filing: 1979-04-03
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Granted: 1981-02-17
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Expires: 1999-04-03
Abstract
Abstract This invention relates to a high molecular weight terpolymer of ethylene, sulfur dioxide and carbon monoxide stable to 280 DEG C. and containing as little as 36 mol % ethylene and about 41-51 mol % sulfur dioxide; and to the method of producing said terpolymer by irradiation of a liquid and gaseous mixture of ethylene, sulfur dioxide and carbon monoxide by means of Co-60 gamma rays or an electron beam, at a temperature of about 10 DEG -50 DEG C., and at a pressure of about 140 to 680 atmospheres, to initiate polymerization.
Inventors
- 👤 Richard Johnson
- 👤 Meyer Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:46
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22; Y; Y10; Y10S; Y10S522/00; Y10S522/911
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
71 words
High molecular weight solid terpolymer of ethylene, sulfur dioxide and carbon monoxide, stable to 280° C., containing as little as 36 mol% ethylene units and about 41-51 mol% sulfur dioxide units, prepared by the irradiation of a liquid and gaseous mixture of ethylene, carbon monoxide and sulfur dioxide, at a temperature of about 10°-50° C., to initiate polymerization, and allowing the polymerization to proceed to its conclusion outside said radiation field.
Claim 2
Dependent Claim
71 words
High molecular weight solid terpolymer of ethylene, sulfur dioxide and carbon monoxide, stable to 280° C., containing as little as 36 mol% ethylene units and about 41-51 mol% sulfur dioxide units, prepared by the irradiation of a liquid and gaseous mixture of ethylene, carbon monoxide and sulfur dioxide, at a temperature of about 10°-50° C., to initiate polymerization, and allowing the polymerization to proceed to its conclusion outside said radiation field.
Claim 3
Independent Claim
74 words
A method of preparing a solid terpolymer of ethylene, sulfur dioxide and carbon dioxide which comprises subjecting a liquid and gaseous mixture of said components to irradiation by means of Cobalt-60 gamma rays or an electron beam, at a temperature of about 10°-50° C., and at a pressure of about 140-680 atmospheres for a period of about 5 minutes to 3 hours, in an environment substantially free of contaminants, to initiate and complete polymerization.
Claim 4
Independent Claim
74 words
A method of preparing a solid terpolymer of ethylene, sulfur dioxide and carbon dioxide which comprises subjecting a liquid and gaseous mixture of said components to irradiation by means of Cobalt-60 gamma rays or an electron beam, at a temperature of about 10°-50° C., and at a pressure of about 140-680 atmospheres for a period of about 5 minutes to 3 hours, in an environment substantially free of contaminants, to initiate and complete polymerization.
Claim 5
Dependent Claim
38 words
A method in accordance with claim 2, wherein the mixture of said components is subjected to a radiation dose of about 0.05 to 3.2 megarads at a radiation intensity rate of about 0.6 to 6.4 megarads per hour.
Claim 6
Dependent Claim
43 words
A method in accordance with claim 2, wherein said mixture is subjected to a total radiation dose of about 0.05 to 0.5 megarads for a period of about 5 minutes to 1/2 hour, at a radiation intensity rate of 0.6-0.9 megarads per hour.
Claim 7
Dependent Claim
24 words
A method in accordance with claim 4, wherein polymerization is initiated by said radiation dose and continues to its conclusion outside said radiation field.
Claim 8
Dependent Claim
18 words
A method in accordance with claim 2, wherein irradiation with Co-60 gamma rays is conducted at 10°-13° C.
Claim 9
Dependent Claim
21 words
A method in accordance with claim 2, wherein irradiation with an electron beam is conducted at a temperature of 10°-20° C.
Claim 10
Dependent Claim
31 words
A terpolymer prepared in accordance with the method of claim 2, consisting of the polymerization product of 36 mol % ethylene, 42 mol% sulfur dioxide and 22 mol % carbon monoxide.
References Cited (Backward Citations)
US2634254A
Cited
US3058899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |