US3718628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vulcanization of ethylene-propylene-diene terpolymers
Assignee: Sunoco Inc
•
Filing: 1970-06-23
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Granted: 1973-02-27
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Expires: 1990-06-23
Abstract
Abstract Ethylene-propylene-diene terpolymer elastomer compositions having improved vulcanization properties containing auxiliary vulcanization accelerators selected from mono and dihydrazide derivatives of monobasic and dibasic organic acids containing C2 to C40 carbon atoms and having alkyl, aryl, alkenyl and cyclic structures.
Inventors
- 👤 J Boyer
- 👤 R Cassar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:28
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/24; C08K5/25; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
17 words
A composition according to claim 1 wherein the vulcanization improving compound is the dihydrazide of succinic acid.
Claim 2
Dependent Claim
17 words
A composition according to claim 1 wherein the vulcanization improving compound is the dihydrazide of adipic acid.
Claim 3
Dependent Claim
10 words
A composition according to claim 1 wherein R is aliphatic.
Claim 4
Dependent Claim
14 words
A composition according to claim 4 wherein the the vulcanization improving compound is acethydrazide.
Claim 5
Dependent Claim
10 words
A composition according to claim 1 wherein R is aromatic.
Claim 6
Dependent Claim
17 words
A composition according to claim 6 wherein the vulcanization improving compound is the hydrazide of benzoic acid.
Claim 7
Dependent Claim
11 words
A composition according to claim 1 wherein the polymer is ethylene-propylene-1,4-hexadiene.
Claim 8
Dependent Claim
96 words
In the process of vulcanizing sulfur-vulcanizable ethylene-propylene-diene polymer which comprises mixing ethylene-propylene-diene polymer with a sulfur containing vulcanizing agent, the improvement which comprises improving the cure-rate of the composition by adding to the composition prior to heating a vulcanization improving quantity of an auxiliary accelerator selected from the group of compounds having a structural formula wherein R is selected from the group consisting of C1 to C40 aryl, alkyl, alkenyl and cyclic divalent hydrocarbon radicals or wherein R is selected from the group consisting of C1 to C40 aryl, alkyl, alkenyl and cyclic monovalent hydrocarbon radicals.
Claim 9
Dependent Claim
11 words
A method according to claim 9 wherein in polymer is ethylene-propylene-1,4-hexadiene.
Claim 10
Dependent Claim
12 words
A process according to claim 9 wherein the auxiliary accelerator is acethydrazide.
Claim 11
Dependent Claim
14 words
A process according to claim 9 wherein the auxiliary accelerator is benzoic acid hydrazide.
Claim 12
Dependent Claim
14 words
A process according to claim 9 wherein the auxiliary accelerator is adipic acid dihydrazide.
Claim 13
Dependent Claim
14 words
A process according to claim 9 wherein the auxiliary accelerator is phthalic acid dihydrazide.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |