Patent US3821152A successfully refreshed from Google Patents.
US3821152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat resistant vulcanizable blend of butadiene/styrene rubbers and ethylene propylene-diene terpolymers
Assignee: Phillips Petroleum Co
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Filing: 1973-01-19
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Granted: 1974-06-28
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Expires: 1993-01-19
Abstract
Abstract A sulfur vulcanizable blend having improved properties is obtained by blending from 40 to 60 parts by weight of a solution polymerized copolymer of butadiene and styrene, from 10 to 55 parts by weight of an emulsion polymerized copolymer of butadiene and styrene, from 25 to 45 parts by weight of a termpolymer of ethylene, propylene and a diene comonomer, from 40 to 70 parts by weight of an extender oil per 100 parts by weight of total polymer, and from 120 to 200 parts by weight of carbon black per 100 parts by weight of total polymer.
Inventors
- 👤 W Cornell
- 👤 R Siedenstrang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:04
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; C08K; C08K3/00; C08K3/02; C08K3/04; C08L23/00; C08L23/02; C08L23/16; C08L9/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
34 words
A blend in accordance with claim 1 wherein said solution polymerized copolymer of butadiene and styrene has a butadiene-to-styrene molar ratio in the range of about 73:27 to about 77:23 with no detectable polystyrene.
Claim 2
Dependent Claim
31 words
A blend in accordance with claim 1 wherein said emulsion polymerized copolymer of butadiene and styrene has a butadiene-to-styrene molar ratio in the range of about 74:26 to about 78: 22.
Claim 3
Dependent Claim
29 words
A blend in accordance with claim 1 wherein said blend has a compression set (ASTM-D 395-61) of less than 22 and an uncured hardness of at least about 70.
Claim 4
Dependent Claim
53 words
A blend in accordance with claim 1 wherein said terpolymer has an ethylene-to-propylene molar ratio in the range of about 70:30 to about 60:40, with said diene comonomer being present in an amount in the range of about 1.5 to about 5 mol percent based on the total mols of ethylene and propylene.
Claim 5
Dependent Claim
55 words
A blend in accordance with claim 5 wherein said solution polymerized copolymer of butadiene and styrene has a butadiene-to-styrene molar ratio in the range of about 73:27 to about 77: 23, and wherein said emulsion polymerized copolymer of butadiene and styrene has a butadiene-to-styrene molar ratio in the range of about 74:26 to about 78:22.
Claim 6
Dependent Claim
64 words
A blend in accordance with claim 6 wherein said solution polymerized copolymer was produced by solution polymerizing butadiene and styrene in a hydrocarbon diluent in the presence of an alkali metal initiator and of tetrahydrofuran as a randomizing agent and was shortstopped with fatty acid, and wherein said emulsion polymerized copolymer has a Compound Mooney in the range of about 46 to about 56.
Claim 7
Dependent Claim
14 words
A blend in accordance with claim 7 wherein said diene comonomer is ethylidene norbornene.
Claim 8
Dependent Claim
13 words
A blend in accordance with cLaim 1 further comprising a sulfur-containing vulcanizing agent.
Claim 9
Dependent Claim
11 words
A molded vulcanized article prepared from the blend of claim 9.
Claim 10
Dependent Claim
31 words
A flexible mandrel prepared from the blend of claim 9, and which has a compression set (ASTM-D 395-61) of less than 25 and an uncured hardness of at least about 70.
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 |