US4396743A
Expired / Lapsed
US
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Rubber composition for tires containing block copolymer having vinyl bonds
Assignee: Bridgestone Corp
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Filing: 1981-12-23
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Granted: 1983-08-02
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Expires: 2001-12-23
Abstract
Abstract A rubber composition adapted to be used as a tread rubber is disclosed. The rubber composition has remarkably improved resistance against heat generation, breakage resistance, wear resistance, wet skid resistance and low-temperature brittleness, and consists mainly of a rubber blend consisting of 20-95 parts by weight of a styrene-butadiene block copolymer having a specifically limited structure and 80-5 parts by weight of a diene rubber.
Inventors
- 👤 Tatsuo Fujimaki
- 👤 Tomoharu Yamada
- 👤 Seisuke Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:56
CPC Classifications
C; C08; C08L; C08L9/00; B; B60; B60C; B60C1/00; B60C1/0016; C08L53/00; C08L53/02; Y; Y10; Y10S; Y10S152/00; Y10S152/905; Y10S525/00; Y10S525/914
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
A rubber composition for tires, consisting mainly of a rubber blend consisting of 20-95 parts by weight of a styrene-butadiene block copolymer and 80-5 parts by weight of a diene rubber; said styrene-butadiene block copolymer being a copolymer obtained by block copolymerizing styrene with 1,3-butadiene, consisting of a random copolymer block (A) and a random copolymer block (B), the fraction of the copolymer block (A) being 10-90% by weight, and having a total bonded styrene content of 10-40% by weight and a total vinyl bond content in the total bonded butadiene unit of 25-70% by weight; said random copolymer block (A) having a bonded styrene content of 20-50% by weight and a vinyl bond content in the butadiene unit of 40-75% by weight; and said random copolymer block (B) having a bonded styrene content of not higher than 10% by weight and a vinyl bond content in the butadiene unit of 20-50% by weight.
Claim 2
Dependent Claim
154 words
A rubber composition for tires, consisting mainly of a rubber blend consisting of 20-95 parts by weight of a styrene-butadiene block copolymer and 80-5 parts by weight of a diene rubber; said styrene-butadiene block copolymer being a copolymer obtained by block copolymerizing styrene with 1,3-butadiene, consisting of a random copolymer block (A) and a random copolymer block (B), the fraction of the copolymer block (A) being 10-90% by weight, and having a total bonded styrene content of 10-40% by weight and a total vinyl bond content in the total bonded butadiene unit of 25-70% by weight; said random copolymer block (A) having a bonded styrene content of 20-50% by weight and a vinyl bond content in the butadiene unit of 40-75% by weight; and said random copolymer block (B) having a bonded styrene content of not higher than 10% by weight and a vinyl bond content in the butadiene unit of 20-50% by weight.
Claim 3
Dependent Claim
44 words
A rubber composition for tires according to claim 1, wherein said rubber blend consists of 20-80 parts by weight of the styrene-butadiene block copolymer and 80-20 parts by weight of a diene rubber having a glass transition temperature of not higher than -50° C.
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |