Patent US3975335A successfully refreshed from Google Patents.
US3975335A
Expired / Lapsed
US
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Sulphurcurable polymer of ethylene and at least one other α-alkene with reduced cold flow properties
Assignee: Stamicarbon BV
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Filing: 1971-08-02
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Granted: 1976-08-17
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Expires: 1991-08-02
Abstract
Abstract The present disclosure relates to the preparation of curable polymers of ethylene with at least one alpha -alkene and a 5-alkylidene norbornene-2 showing a reduced cold-flow obtained by the incorporation of dicyclopentadiene in amounts of at least 0.2 % and preferably between 0.4 and 2.2 % by weight with respect to the amount of polymer and in a molar ratio of less than 1 : 5 to the norbornene derivative.
Inventors
- 👤 Meindert Tiessens
- 👤 Henricus J. M. Van Gorcom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:02
CPC Classifications
C; C08; C08F; C08F210/00; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
Polymers composed of 20.0-74 % by weight of ethylene, 24 - 78 % by weight of one or more α-alkenes and at least 0.140 mole of dicyclopentadiene and 5-alkylidene norbornene-2 per 1000 g of polymer, the molar ratio of dicyclopentadiene to 5-alkenyl norbornene being lower than 1 : 6.
Claim 2
Dependent Claim
49 words
Polymers composed of 20.0-74 % by weight of ethylene, 24 - 78 % by weight of one or more α-alkenes and at least 0.140 mole of dicyclopentadiene and 5-alkylidene norbornene-2 per 1000 g of polymer, the molar ratio of dicyclopentadiene to 5-alkenyl norbornene being lower than 1 : 6.
References Cited (Backward Citations)
US3554988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |