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US4485205A
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Rubber compositions suitable for tires comprising amorphous styrene-butadiene copolymer
Assignee: Bridgestone Corp
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Filing: 1982-11-29
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Granted: 1984-11-27
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Expires: 2002-11-29
Abstract
Abstract Rubber compositions for tires having low rolling resistance and excellent running stability consist mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene and containing 3-30% by weight of bonded styrene and not less than 60% by weight of 1,2-bond in butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60° C.
Inventors
- 👤 Tatsuo Fujimaki
- 👤 Tomoharu Yamada
- 👤 Keiko Katayama
- 👤 Seisuke Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:29
CPC Classifications
C; C08; C08L; C08L7/00; C08L21/00; C08L9/00; C08L9/06; C08L23/00; C08L23/02; C08L23/16; Y; Y10; Y10S; Y10S152/00; Y10S152/905; Y10S525/00; Y10S525/914
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
Rubber compositions for tires consisting mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene in the presence of an alkyl-lithium catalyst and containing 3-30% by weight of bonded styrene and not less than 60% by weight of 1,2-bond in the butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60° C., said dienic rubber being at least one member selected from the group consisting of natural rubber, synthetic polyisoprene rubber, polybutadiene rubber and ethylene-propylene-diene ternary copolymeric rubber.
Claim 2
Dependent Claim
101 words
Rubber compositions for tires consisting mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene in the presence of an alkyl-lithium catalyst and containing 3-30% by weight of bonded styrene and not less than 60% by weight of 1,2-bond in the butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60° C., said dienic rubber being at least one member selected from the group consisting of natural rubber, synthetic polyisoprene rubber, polybutadiene rubber and ethylene-propylene-diene ternary copolymeric rubber.
Claim 3
Dependent Claim
26 words
Rubber compositions as claimed in claim 1, wherein the glass transition temperature of the high vinyl amorphous butadiene-styrene copolymeric rubber is -35° C. to 0° C.
Claim 4
Dependent Claim
75 words
Rubber compositions for tires consisting mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene in the presence of an alkyl-lithium catalyst containing 3-10% by weight of bonded styrene and more than 80% to 95% by weight of 1,2-bond in the butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60° C.
Claim 5
Dependent Claim
75 words
Rubber compositions for tires consisting mainly of a rubber blend consisting of 10-90% by weight of a high vinyl amorphous butadiene-styrene copolymeric rubber obtained by copolymerizing styrene with 1,3-butadiene in the presence of an alkyl-lithium catalyst containing 3-10% by weight of bonded styrene and more than 80% to 95% by weight of 1,2-bond in the butadiene unit, and 90-10% by weight of a dienic rubber having a glass transition temperature of lower than -60° C.
Claim 6
Dependent Claim
26 words
Rubber compositions as claimed in claim 3, wherein the glass transition temperature of the high vinyl amorphous butadiene-styrene copolymeric rubber is -35° C. to 0° C.
Claim 7
Dependent Claim
27 words
Rubber compositions as claimed in claim 3, wherein the dienic rubber is natural rubber, synthetic polyisoprene rubber, polybutadiene rubber, styrene-butadiene copolymeric rubber or ethylene-propylene-diene ternary copolymeric rubber.
Claim 8
Dependent Claim
40 words
Rubber compositions as claimed in claim 1, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
Claim 9
Dependent Claim
40 words
Rubber compositions as claimed in claim 2, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
Claim 10
Dependent Claim
40 words
Rubber compositions as claimed in claim 3, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
Claim 11
Dependent Claim
40 words
Rubber compositions as claimed in claim 4, which contain 1-40 parts by weight of a softening agent and 5-70 parts by weight of carbon black, said parts by weight being based on 100 parts by weight of the rubber blend.
Claim 12
Dependent Claim
13 words
Rubber compositions as claimed in claim 1, wherein said alkyl-lithium catalyst is n-butyl-lithium.
Claim 13
Dependent Claim
13 words
Rubber compositions as claimed in claim 3, wherein said alkyl-lithium catalyst is n-butyl-lithium.
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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |