US4334567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tires
Assignee: Shell Internationale Research Maatschappij BV
•
Filing: 1980-03-26
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Granted: 1982-06-15
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Expires: 2000-03-26
Abstract
Abstract A tire whose tread comprises as elastomer a styrene-butadiene or a styrene-isoprene co-polymer having a glass transition temperature above minus 50° C., said composition having a rebound resilience of 55% or more. The glass transition temperature is preferably between minus 40° C. and minus 25° C. and the rebound resilience is preferably between 60% and 70%.
Inventors
- 👤 Robert Bond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:09
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; C; C08; C08L; C08L9/00; C08L9/06; C08L53/00; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A tire comprising sidewalls, beads, and a tread, whose tread composition having improved wet grip and rolling resistance is formed of an elastomer composition containing as the elastomer a styrene-butadiene copolymer or a styrene-isoprene copolymer, the unvulcanized polymer forming the elastomer having a glass transition temperature of above about minus 50° C. to about minus 20° C., and said vulcanized tread composition having a rebound resilience of about 55% to about 95% measured using the Dunlop Pendulum at 50° C., according to B.S. 903/1950.
Claim 2
Dependent Claim
84 words
A tire comprising sidewalls, beads, and a tread, whose tread composition having improved wet grip and rolling resistance is formed of an elastomer composition containing as the elastomer a styrene-butadiene copolymer or a styrene-isoprene copolymer, the unvulcanized polymer forming the elastomer having a glass transition temperature of above about minus 50° C. to about minus 20° C., and said vulcanized tread composition having a rebound resilience of about 55% to about 95% measured using the Dunlop Pendulum at 50° C., according to B.S. 903/1950.
Claim 3
Dependent Claim
24 words
A tire according to claim 1, in which said glass transition temperature is in the range from minus 45° C. to minus 20° C.
Claim 4
Dependent Claim
24 words
A tire according to claim 2, in which said glass transition temperature is in the range from minus 40° C. to minus 25° C.
Claim 5
Dependent Claim
15 words
A tire according to claim 1, in which said rebound resilience is 60% or more.
Claim 6
Dependent Claim
19 words
A tire according to claim 4, in which said rebound resilience is in the range from 60% to 70%.
Claim 7
Dependent Claim
24 words
A tire according to claim 1, in which said copolymer has a styrene content of not more than 40% by weight of the copolymer.
Claim 8
Dependent Claim
26 words
A tire according to claim 6, in which said copolymer has a styrene content in the range from 20% to 40% by weight of the copolymer.
Claim 9
Dependent Claim
29 words
A tire according to claim 1, in which said copolymer is a styrene-butadiene copolymer and from 50% to 80% of the butadiene has polymerised at the butadiene 1,2 position.
Claim 10
Dependent Claim
22 words
A tire according to claim 8, in which from 60% to 75% of the butadiene has polymerised at the butadiene 1,2 position.
Claim 11
Dependent Claim
19 words
A tire according to claim 6, in which said copolymer has styrene blocks at the ends of its molecules.
Claim 12
Dependent Claim
24 words
A tire according to claim 6, in which said copolymer is a styrene-butadiene copolymer and has butadiene blocks at the ends of its molecules.
Claim 13
Dependent Claim
82 words
A tire according to claim 1, in which said copolymer is a styrene-butadiene copolymer having a styrene content in the range from 20% to 25% and a butadiene content correspondingly in the range from 80% to 75% by weight, a molecular weight in the range 400,000 to 500,000, a glass transition temperature in the range from minus 30° C. to minus 40° C., and in which from 60% to 75% by weight of the butadiene has polymerised at the butadiene 1,2 position.
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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) | 1985-06-14 | 1985-12-14 | 1986-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-14 | 1989-12-14 | 1990-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-14 | 1993-12-14 | 1994-06-15 | $7700.00 | Window Closed / Lapsed |