US4487892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber compositions for use in tires
Assignee: Bridgestone Corp
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Filing: 1983-03-30
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Granted: 1984-12-11
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Expires: 2003-03-30
Abstract
Abstract A rubber composition for use in tires is disclosed, which comprises 1-30% by weight of a non-crystallizable resinous polymer having Tg of not less than 110° C. and 70-99% by weight of at least one rubber selected from styrene-butadiene copolymer rubber containing not more than 60% by weight of bound styrene, natural rubber, polybutadiene rubber having 1,4-configuration of not less than 80%, polybutadiene rubber having 1,2-configuration of not less than 50%, butyl rubber, halogenated butyl rubber and polyisoprene rubber having cis-1,4-configuration of not less than 90%.
Inventors
- 👤 Toshio Ohmori
- 👤 Mineo Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:36
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; C; C08; C08L; C08L21/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A rubber composition for use in tires comprising: (A) 1 to 30% by weight of at least one non-crystallizable resinous polymer having a glass transition temperature of not less than 110° C. selected from the group consisting of α-methylstyrene homopolymer, α-methylstyrene-styrene copolymer, nuclear-substituted styrene homopolymer, nuclear-substituted α-methylstyrene homopolymer, styrene-nuclear-substituted styrene copolymer, styrene-nuclear-substituted α-methylstyrene copolymer and copolymers thereof containing a diene monomer; and (B) 70 to 99% by weight of at least one rubber selected from the group consisting of styrene-butadiene copolymer rubber containing not more than 60% by weight of bound styrene produced by emulsion polymerization or solution polymerization using an organic alkali metal catalyst, natural rubber, polybutadiene rubber having a 1,4-configuration of not less than 80%, polybutadiene rubber having a 1,2-configuration of not less than 50%, halogenated butyl rubber, butyl rubber and polyisoprene rubber having a cis-1,4-configuration of not less than 90%.
Claim 2
Dependent Claim
143 words
A rubber composition for use in tires comprising: (A) 1 to 30% by weight of at least one non-crystallizable resinous polymer having a glass transition temperature of not less than 110° C. selected from the group consisting of α-methylstyrene homopolymer, α-methylstyrene-styrene copolymer, nuclear-substituted styrene homopolymer, nuclear-substituted α-methylstyrene homopolymer, styrene-nuclear-substituted styrene copolymer, styrene-nuclear-substituted α-methylstyrene copolymer and copolymers thereof containing a diene monomer; and (B) 70 to 99% by weight of at least one rubber selected from the group consisting of styrene-butadiene copolymer rubber containing not more than 60% by weight of bound styrene produced by emulsion polymerization or solution polymerization using an organic alkali metal catalyst, natural rubber, polybutadiene rubber having a 1,4-configuration of not less than 80%, polybutadiene rubber having a 1,2-configuration of not less than 50%, halogenated butyl rubber, butyl rubber and polyisoprene rubber having a cis-1,4-configuration of not less than 90%.
Claim 3
Dependent Claim
110 words
A rubber composition according to claim 1, wherein said rubber composition comprises 1 to 30% by weight of (I) said non-crystallizable resinous polymer, 15 to 99% by weight of (II) styrene-butadiene copolymer rubber containing more than 30% by weight but not more than 50% by weight of bound styrene, and 0 to 84% by weight of at least one rubber selected from styrene-butadiene copolymer rubber containing not less than 30% by weight of bound styrene, natural rubber, polybutadiene rubber having 1,4-configuration of not less than 80%, polybutadiene rubber having 1,2-configuration of not less than 50%, polyisoprene rubber having cis-1,4-configuration of not less than 90%, halogenated butyl rubber and butyl rubber.
Claim 4
Dependent Claim
90 words
A rubber composition according to claim 1, wherein said rubber composition comprises 1 to 30% by weight of (I) said non-crystallizable resinous polymer, 30 to 99% by weight of (II) styrene-butadiene copolymer rubber containing 15 to 30% by weight of bound styrene, and 0 to 69% by weight of at least one rubber selected from natural rubber, polybutadiene rubber having 1,4-configuration of not less than 80%, polybutadiene rubber having 1,2-configuration of not less than 50%, halogenated butyl rubber, butyl rubber and polyisoprene rubber having cis-1,4-configuration of not less than 90%.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |