US4224197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber composition for tire tread
Assignee: Zeon Corp
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Filing: 1979-07-09
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Granted: 1980-09-23
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Expires: 1999-07-09
Abstract
Abstract A rubber composition for the tread of tire having reduced rolling resistance and increased wet skid resistance with the mechanical properties unimpaired, said rubber composition comprising 20 to 80% by weight of (I) essentially amorphous polybutadiene having a 1,2-bond units content of at least 70% and a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 100; 10 to 75% by weight of (II) polybutadiene rubber having a 1,2-bond units content of 20% or less and a Mooney viscosity (ML 1+4 , 100° C.) of 20 to 130; and 3 to 35% by weight of (III) at least one rubber selected from styrene/butadiene copolymer rubber having a bound styrene content of 15 to 25% by weight, natural rubber, and polyisoprene rubber having a cis-1,4-bond units content of at least 90%.
Inventors
- 👤 Akio Ueda
- 👤 Shuichi Akita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:22
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; C; C08; C08L; C08L9/00; C08L7/00; C08L9/06; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
A rubber composition for the tread of tire having reduced rolling resistance and increased wet skid resistance with the mechanical properties unimpaired, said rubber composition comprising 20 to 80% by weight of (I) essentially amorphous polybutadiene having a 1,2-bond units content of at least 70% and a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 100; 10 to 75% by weight of (II) polybutadiene rubber having a 1,2-bond units content of 20% or less and a Mooney viscosity (ML 1+4 , 100° C.) of 20 to 130; and 3 to 35% by weight of (III) at least one rubber selected from styrene/butadiene copolymer rubber having a bound styrene content of 15 to 25% by weight, natural rubber, and polyisoprene rubber having a cis-1,4-bond units content of at least 90%.
Claim 2
Dependent Claim
131 words
A rubber composition for the tread of tire having reduced rolling resistance and increased wet skid resistance with the mechanical properties unimpaired, said rubber composition comprising 20 to 80% by weight of (I) essentially amorphous polybutadiene having a 1,2-bond units content of at least 70% and a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 100; 10 to 75% by weight of (II) polybutadiene rubber having a 1,2-bond units content of 20% or less and a Mooney viscosity (ML 1+4 , 100° C.) of 20 to 130; and 3 to 35% by weight of (III) at least one rubber selected from styrene/butadiene copolymer rubber having a bound styrene content of 15 to 25% by weight, natural rubber, and polyisoprene rubber having a cis-1,4-bond units content of at least 90%.
Claim 3
Dependent Claim
129 words
A rubber composition for tire tread as recited in claim 1, wherein the rubber composition comprises 30 to 60% by weight of the essentially amorphous polybutadiene (I) having a 1,2-bond units content of 85 to 95% and a Mooney viscosity (ML 1+4 , 100° C.) of 30 to 60; 20 to 60% by weight of the polybutadiene rubber (II) having a 1,2-bond units content of 20% or less and a Mooney viscosity (ML 1+4 , 100° C.) of 30 to 60 and being obtained by solution polymerization; and 5 to 25% by weight of at least one rubber (III) selected from styrene/butadiene copolymer rubber having a bound styrene content of 15 to 25% by weight, natural rubber, and polyisoprene rubber having a cis-1,4-bond units content of at least 90%.
Claim 4
Dependent Claim
44 words
A rubber composition for tire tread as recited in claim 1 or 2, wherein at least one of the polybutadiene (I), the polybutadiene rubber (II) and the rubber (III) contains 10 to 30%, based on the weight thereof, of an extender oil for rubber.
References Cited (Backward Citations)
US3827991A
Cited
US3978165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |