US4104334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber composition
Assignee: Phillips Petroleum Co
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Filing: 1975-10-09
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Granted: 1978-08-01
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Expires: 1995-10-09
Abstract
Abstract A halogen free rubber composition consisting essentially of 70-90 parts per weight of at least one butyl rubber, 30-10 parts per weight of at least one random copolymer of a monovinylaromatic monomer of 8-12 carbon atoms and a conjugated diene monomer of 4-8 carbon atoms and a vulcanizing agent exhibits high hardness and low resilience.
Inventors
- 👤 Kenneth E. Snavely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:43
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
A halogen-free vulcanizable rubber composition consisting essentially of from 70 to 90 parts per hundred parts rubber of at least one butyl rubber, and from 30 to 10 parts per hundred parts rubber of at least one solution formed random copolymer of at least one vinylaromatic monomer of 8 to 12 carbon atoms and a conjugated acyclic diene monomer of 4 to 8 carbon atoms, said random copolymer having been produced by polymerizing said vinylaromatic monomer and said acyclic diene monomer in solution in the presence of a randomizing agent, wherein the total quantity of the butyl rubber and the solution formed random copolymer is 100 parts per hundred parts rubber, and from 0.1 to 8 parts per hundred parts rubber of a vulcanizing agent selected from the group consisting of sulfur, tetramethylthiuram disulfide, dimorpholinyl disulfide, and dibutylxanthogen disulfide, and mixtures thereof.
Claim 2
Dependent Claim
142 words
A halogen-free vulcanizable rubber composition consisting essentially of from 70 to 90 parts per hundred parts rubber of at least one butyl rubber, and from 30 to 10 parts per hundred parts rubber of at least one solution formed random copolymer of at least one vinylaromatic monomer of 8 to 12 carbon atoms and a conjugated acyclic diene monomer of 4 to 8 carbon atoms, said random copolymer having been produced by polymerizing said vinylaromatic monomer and said acyclic diene monomer in solution in the presence of a randomizing agent, wherein the total quantity of the butyl rubber and the solution formed random copolymer is 100 parts per hundred parts rubber, and from 0.1 to 8 parts per hundred parts rubber of a vulcanizing agent selected from the group consisting of sulfur, tetramethylthiuram disulfide, dimorpholinyl disulfide, and dibutylxanthogen disulfide, and mixtures thereof.
Claim 3
Dependent Claim
19 words
The composition of claim 1 wherein said vinylaromatic monomer is styrene and said conjugated acyclic diene monomer is butadiene.
Claim 4
Dependent Claim
39 words
A composition according to claim 2 wherein said butyl rubber is a copolymer of about 97 to 99 mole percent of isobutylene and about 3 to 1 mole percent of a conjugated diene having 4 to 12 carbon atoms.
Claim 5
Dependent Claim
32 words
A composition according to claim 1 wherein said random copolymer is a solution polymerized copolymer consisting of 52 weight percent butadiene and 48 weight percent styrene, and said randomizing agent is tetrahydrofuran.
Claim 6
Dependent Claim
31 words
A composition according to claim 4 wherein said copolymer was solution-polymerized using a n-butyllithium initiator, the polymerization was terminated by a fatty acid and the copolymer contains about 10 percent polystyrene.
Claim 7
Dependent Claim
8 words
A vulcanized composition in accordance with claim 8.
References Cited (Backward Citations)
US3798190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |