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US4510291A
Expired / Lapsed
US
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Rubber compositions for tire treads
Assignee: Yokohama Rubber Co Ltd
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Filing: 1983-09-07
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Granted: 1985-04-09
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Expires: 2003-09-07
Abstract
Abstract A rubber composition for tire treads having improved wear resistance and wet grip property without impairing rolling resistance, comprising two different specific styrene-butadiene copolymer rubbers and a specific polybutadiene rubber as the rubber ingredients in specific mixing ratios.
Inventors
- 👤 Kinya Kawakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:51
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; B; B60; B60C; B60C1/00; B60C1/0016; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
158 words
A rubber composition for tire treads which comprises as the rubber ingredients (I) a styrene-butadiene copolymer rubber having a styrene content of 30-60% by weight, (II) a polybutadiene rubber having a trans 1,4-bonded butadiene content of at least 60% by weight and a glass transition temperature of from -100° C. to -50° C. and (III) a styrene-butadiene copolymer rubber having a styrene content of 5-25% by weight and a 1,2-bonded butadiene content of 20-60% by weight of the butadiene portion of the rubber (III), in such amounts that the styrene-butadiene copolymer rubber (I) and polybutadiene rubber (II) are present in a total amount of 20-80% by weight of the whole of the rubber ingredients, the styrene-butadiene copolymer rubber (III) is present in an amount of 80-20% by weight of the whole of the rubber ingredients and the styrene content of the rubber (I) is equal to 5-25% by weight of the total of the rubbers (I) and (II).
Claim 2
Dependent Claim
158 words
A rubber composition for tire treads which comprises as the rubber ingredients (I) a styrene-butadiene copolymer rubber having a styrene content of 30-60% by weight, (II) a polybutadiene rubber having a trans 1,4-bonded butadiene content of at least 60% by weight and a glass transition temperature of from -100° C. to -50° C. and (III) a styrene-butadiene copolymer rubber having a styrene content of 5-25% by weight and a 1,2-bonded butadiene content of 20-60% by weight of the butadiene portion of the rubber (III), in such amounts that the styrene-butadiene copolymer rubber (I) and polybutadiene rubber (II) are present in a total amount of 20-80% by weight of the whole of the rubber ingredients, the styrene-butadiene copolymer rubber (III) is present in an amount of 80-20% by weight of the whole of the rubber ingredients and the styrene content of the rubber (I) is equal to 5-25% by weight of the total of the rubbers (I) and (II).
Claim 3
Dependent Claim
18 words
The rubber composition according to claim 1, wherein the 1,2-bonded butadiene in said (III) is 30-55% by weight.
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) | 1988-04-08 | 1988-10-08 | 1989-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-08 | 1992-10-08 | 1993-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-08 | 1996-10-08 | 1997-04-09 | $7700.00 | Window Closed / Lapsed |