Patent US2921569A successfully refreshed from Google Patents.
Patent US3577473A successfully refreshed from Google Patents.
US3577473A
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Method for producing 5-isopropylidene-2-norbornene
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1968-10-04
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Granted: 1971-05-04
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Expires: 1988-10-04
Abstract
Abstract 5-ISOPROPYLIDENE-2-NORBORNENE IS PRODUCED BY SUBJECTING CYCLOPENTADIENE AND 2-METHYL-3-BUTENE-2-OL TO DIELSALDER REACTION TO OBTAIN A,A-DIMETHYL-5-NORBORNENE-2METHANOL (A MIXTURE OF ENDO-FORM AND EXO-FORM), DEHYDRATING THE A,A-DIMETHYL-5-NORBORNENE-2-METHANOL TO FORM A MIXTURE OF ENDO- AND EXO-5-ISOPROPENYL-2-NORBORNENE MIXTURE CONTAINING, IN PART, 5-ISOPROPYLIDENE-2-NORBORNENE, AND CONTACTING THE MIXTURE WITH AN ALKALINE CATALYST. THE 5-ISOPROPYLIDENE-2-NORBORNEN IS USEFUL AS A TERMONOMER OF A SO-CALLED ETHYLENE-PROPYLENE TERPOLYMER RUBBER, AND THE INCORPORATION THEREOF RESULTS IN A TERPOLYMER HAVING EXCELLENT CURING CHARACTERISTICS.
Inventors
- 👤 Tsuneyuki Nagase
- 👤 Fujio Masuko
- 👤 Yukio Yoneyoshi
- 👤 Masami Fukao
- 👤 Masahiro Fujiwara
- 👤 Gohu Suzukamo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:26
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/93; C07C; C07C1/00; C07C1/20; C07C1/24; C07C13/00; C07C13/28; C07C13/32; C07C13/39; C07C13/42; C07C13/43; C07C5/00; C07C5/22; C07C5/23; C07C5/25; C07C5/2506; C07C5/2556; C07C5/2562; C08; C08F; C08F210/00; C07C2523/00; C07C2523/02; C07C2523/04; C07C2527/00; C07C2527/02; C07C2527/053; C07C2527/055; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; C07C2531/00; C07C2531/02; C07C2531/04; C07C2602/00; C07C2602/36; C07C2602/42; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/947
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |