US3817952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Branched epdm copolymers and a process for their manufacture
Assignee: EIDP Inc
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Filing: 1971-11-12
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Granted: 1974-06-18
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Expires: 1991-11-12
Abstract
Abstract A process for producing a vulcanizable branched elastomeric polymer by mixing an EPDM copolymer with sulfur, a sulfurreleasing compound, or a perioxide, and subsequently heating the resultant mixture. The copolymers of the process have less than about 30% gel, a Wallace plasticity of about 30 to 100, and an inherent viscosity of at least about 2.0 at less than 30% gel. Ozone-resistant blends of the copolymers of this invention with other elastomers are also provided.
Inventors
- 👤 L Knabeschuh
- 👤 F Shaw
- 👤 R Souffle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:50
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08K3/00; C08K3/02; C08K3/04; C08K3/06; C08K3/18; C08K3/20; C08K3/22; C08K5/09; C08K5/36; C08L; C08L23/00; C08L23/02; C08L23/16; C08L7/00; C08L91/00; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
44 words
at least one peroxide which generates free radicals, said peroxide being an organic peroxide or hydroperoxide, in the amount of about 0.0005 to 0.003 gram equivalents peroxide per 100 grams copolymer, and B. heating the mixture at a temperature of about 150*C. to 260*C.
Claim 2
Dependent Claim
49 words
A process of claim 1 wherein the promoter is a peroxide from the group: t-butyl peroxypivalate, 2,4-dichlorobenzoyl peroxide, decanoyl peroxide, propionyl peroxide, benzoyl peroxide, hydroxyheptyl peroxide, cyclohexanone peroxide, 2,5-dimethylhexyl-2,5-di(peroxybenzoate), t-butyl perbenzoate, dicumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3, 2, 5-dimethyl-2,5(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, di-t-butyl peroxide, p-methane hydroperoxide, cumene hydroperoxide, 2,5-dimethyl-2,5-di(hydroperoxy)hexane, t-butyl hydroperoxide, and lauroyl peroxide.
Claim 3
Dependent Claim
44 words
The process of claim 1 wherein the promoter is about 0.0005 to 0.003 gram-equivalents of an organic peroxide per 100 grams of copolymer and the heating is conducted at a time and temperature such that at least about one hAlf-life of the peroxide lapses.
Claim 4
Dependent Claim
44 words
The process of claim 1 wherein the promoter is about 0.0005 to 0.003 gram-equivalents of an organic peroxide per 100 grams of copolymer and the heating is conducted at a time and temperature such that at least three half-life periods of the peroxide lapse.
Claim 5
Dependent Claim
13 words
The process of claim 4 wherein the peroxide is t-butyl perbenzoate, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(t-butylperoxy)hexyne-3.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the EPDM copolymer is an ethylene/propylene/1,4-hexadiene copolymer having a Wallace plasticity of about 24-25.
Claim 7
Dependent Claim
9 words
The product prepared by the process of claim 1.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |