Patent US3821134A successfully refreshed from Google Patents.
US3821134A
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Vulcanizable polymer blends of diene rubbers and grafted epdm polymers
Assignee: Goodrich Corp
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Filing: 1973-01-02
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Granted: 1974-06-28
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Expires: 1993-01-02
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
- 👤 P Son
- 👤 K Baranwal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:57
CPC Classifications
C; C08; C08L; C08L21/00; C08F; C08F8/00; C08F8/14; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
A composition of claim 1 wherein (1) is selected from the group consisting of natural rubber, polyisoprenes, polybutadienes, poly(butadiene-styrene) rubbers, poly(isoprenestyrene) rubbers, polychloroprenes, poly(butadiene-acrylonitrile) rubbers, poly(isoprene-acrylonitrile) rubbers, and polypentenamer rubbers.
Claim 2
Dependent Claim
69 words
A composition of claim 2 where in (2) 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 three to about 14 carbon atoms, and from about 0.5 percent to about 20 percent by weight of a nonconjugated diene containing five to about 25 carbon atoms.
Claim 3
Dependent Claim
70 words
A composition of claim 3 where in (2) the ethylene-higher Alpha -olefin-nonconjugated diene polymer consists of about 1 percent to about 10 percent by weight of the said nonconjugated diene, the higher Alpha -olefin is selected from propylene and 1-butene, 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 4
Dependent Claim
13 words
A composition of claim 4 where in (2) the vulcanization accelerator is 4,4''-dithiobismorpholine.
Claim 5
Dependent Claim
13 words
A composition of claim 4 where in (2) the vulcanization accelerator is 4,4''-dithiobispiperidine.
Claim 6
Dependent Claim
13 words
A composition of claim 4 where in (2) the vulcanization accelerator is 2-mercaptobenzothiazole.
Claim 7
Dependent Claim
38 words
A composition of claim 1 containing additionally about 0.1 part to about 1.0 part by weight of an ungrafted vulcanization accelerator selected from the group recited in claim 4 per 100 parts by weight of (1) and (2).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |