US3897405A
Expired / Lapsed
US
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EPDM polymers grafted with vulcanization accelerators
Assignee: Covestro International SA
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Filing: 1974-02-13
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Granted: 1975-07-29
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Expires: 1994-02-13
Abstract
Abstract Preparation of ethylene-higher Alpha -olefin-polyene (EPDM) polymers having grafted thereon vulcanization accelerators and polymer blends with highly unsaturated diene rubbers that are cured using sulfur are disclosed. The vulcanizates exhibit improved properties compared to polymer blends of EPDM and diene rubbers.
Inventors
- 👤 Pyong-Nae Son
- 👤 Krishna C Baranwal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:24
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/14; C08L; C08L21/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
AN ETHYLENE-HIGHER A-OLEFIN-POLYENE POLYMER HAVING GRAFTED THEREON ABOUT 0.1 PART TO ABOUT 10 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE POLYMER A VULZANIZATION ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF (1) THIURAM SULFIDES OF THE FORMULA
Claim 2
Dependent Claim
39 words
AN ETHYLENE-HIGHER A-OLEFIN-POLYENE POLYMER HAVING GRAFTED THEREON ABOUT 0.1 PART TO ABOUT 10 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE POLYMER A VULZANIZATION ACCELERATOR SELECTED FROM THE GROUP CONSISTING OF (1) THIURAM SULFIDES OF THE FORMULA
Claim 3
Dependent Claim
68 words
A grafted polymer of claim 1 wherein the ethylene-higher Alpha -olefin-polyene polymer consists of about 15 percent to about 90 percent by weight of ethylene, about 10 percent to about 80 percent by weight of a higher Alpha -olefin containing 3 to about 14 carbon atoms, and from about 0.5 percent to about 20 percent by weight of a nonconjugated diene containing 5 to about 25 carbon atoms.
Claim 4
Dependent Claim
64 words
A grafted polymer of claim 2 where the ethylene-higher Alpha -olefin-polyene polymer consists of about 1 percent to about 10 percent by weight of nonconjugated diene, the higher Alpha -olefin is propylene or butene-1, and the ethylene and higher Alpha -olefin are present in from about 20 to 80 weight percent of ethylene and about 19 to 70 weight percent of higher Alpha -olefin.
Claim 5
Dependent Claim
12 words
A grafted polymer of claim 3 wherein the vulcanization accelerator is 4,4''-dithiobismorpholine.
Claim 6
Dependent Claim
12 words
A grafted polymer of claim 3 wherein the vulcanization accelerator is 4,4''-dithiobispiperidine.
Claim 7
Dependent Claim
12 words
A grafted polymer of claim 3 wherein the vulcanization accelerator is 2-mercaptobenzothiazole.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |