US4220564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-hardness and high-modulus rubber composition containing 1,2-polybutadiene
Assignee: JSR Corp
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Filing: 1979-01-05
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Granted: 1980-09-02
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Expires: 1999-01-05
Abstract
Abstract A novel rubber composition is obtained by blending a rubber mixture consisting of 15 to 50 parts by weight of 1,2-polybutadiene having a 1,2-addition unit content of 70% or more, a crystallinity of 5 to 40% and an intrinsic viscosity [η] of 0.7 dl/g or more (as measured in toluene at 30° C.) and 85 to 50 parts by weight of at least one rubber selected from the group consisting of natural rubber and diene-based rubbers with 3 to 10 parts by weight of sulfur per 100 parts by weight of said rubber mixture. Said rubber composition has a desirable processability and exhibits, on curing, high hardness, high modulus, low temperature dependency of physical properties, low heat generation and excellent blow-out resistance. It is suitable as a rubber material for use in various low profile automobile tires such as radial tires.
Inventors
- 👤 Tsutomu Tanimoto
- 👤 Mutsuo Nagasawa
- 👤 Junji Kashiwakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:30
CPC Classifications
C; C08; C08L; C08L21/00; C08K; C08K3/00; C08K3/02; C08K3/06; C08L9/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
87 words
A high-hardness and high-modulus rubber composition, comprising: 15 to 50 parts by weight of 1,2-polybutadiene having a 1,2-addition unit content of at least 70%, a crystallinity of 5 to 40% and an intrinsic viscosity [η] of at least 0.7 dl/g as measured in toluene at 30° C., 85 to 50 parts by weight of at least one rubber selected from the group consisting of natural rubber and diene-based rubbers, and 3 to 10 parts by weight of sulfur per 100 parts by weight of the rubber ingredients.
Claim 2
Dependent Claim
87 words
A high-hardness and high-modulus rubber composition, comprising: 15 to 50 parts by weight of 1,2-polybutadiene having a 1,2-addition unit content of at least 70%, a crystallinity of 5 to 40% and an intrinsic viscosity [η] of at least 0.7 dl/g as measured in toluene at 30° C., 85 to 50 parts by weight of at least one rubber selected from the group consisting of natural rubber and diene-based rubbers, and 3 to 10 parts by weight of sulfur per 100 parts by weight of the rubber ingredients.
Claim 3
Dependent Claim
26 words
The rubber composition according to claim 1, wherein the 1,2-polybutadiene has a 1,2-addition unit content of at least 80% and a crystallinity of 10 to 30%.
Claim 4
Dependent Claim
27 words
The rubber composition according to claim 1, wherein the 1,2-polybutadiene has an intrinsic viscosity [η] of 1.0 to 3.0 dl/g as measured in toluene at 30° C.
Claim 5
Dependent Claim
18 words
The rubber composition according to claim 1, wherein the rubber is natural rubber, polyisoprene, styrene-butadiene copolymer, or polybutadiene.
Claim 6
Dependent Claim
15 words
The rubber composition according to claim 1, wherein the rubber is natural rubber or polyisoprene.
Claim 7
Dependent Claim
16 words
The rubber composition according to claim 1, which has a residual crystallinity of up to 4%.
Claim 8
Dependent Claim
16 words
The rubber composition according to claim 1, which has a residual crystallinity of up to 3%.
Claim 9
Dependent Claim
20 words
The rubber composition according to claim 1, which has a coefficient of volume change of at least 100% (in toluene).
Claim 10
Dependent Claim
20 words
The rubber composition according to claim 1, which has a coefficient of volume change of 120 to 200% (in toluene).
Claim 11
Dependent Claim
32 words
The rubber composition according to claim 1, in which the sulfur is contained in an amount of 4 to 8 parts by weight per 100 parts by weight of the rubber ingredienets.
Claim 12
Dependent Claim
28 words
The rubber composition according to claim 1, which further contains 20 to 70 parts by weight of carbon black per 100 parts by weight of the rubber ingredients.
Claim 13
Dependent Claim
28 words
The rubber composition according to claim 1, which further contains 40 to 60 parts by weight of carbon black per 100 parts by weight of the rubber ingredients.
Claim 14
Dependent Claim
29 words
The rubber composition according to claim 1, which further contains 5 to 100 parts by weight of a process oil per 100 parts by weight of the rubber ingredients.
Claim 15
Dependent Claim
29 words
The rubber composition according to claim 1, which further contains 10 to 50 parts by weight of a process oil per 100 parts by weight of the rubber ingredients.
References Cited (Backward Citations)
US3696062A
Cited
US3827991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |