US4786680A
Expired / Lapsed
US
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Rubber composition for tire tread
Assignee: Yokohama Rubber Co Ltd
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Filing: 1987-10-08
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Granted: 1988-11-22
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Expires: 2007-10-08
Abstract
Abstract A rubber composition for a tire tread, comprising natural rubber and/or polyisoprene rubber, a specific styrene-butadiene copolymer rubber, and halogenated butyl rubber.
Inventors
- 👤 Yukizi Suzuki
- 👤 Yasushi Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:28
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; C08L21/00; B; B60; B60C; B60C1/00; B60C1/0016; C08L47/00; C08L7/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A rubber composition for a tire tread comprising: (a) 25 to 55 parts by weight of a rubber selected from the group consisting of natural rubber and polyisoprene rubber; (b) 5 to 15 parts by weight of a halogenated butyl rubber; (c) 70 to 30 parts by weight of a styrenebutadiene copolymer rubber including 10 to 30 wt. % of bonded styrene units and 25 to 80% of 1,2-vinyl bonds in the butadiene units and having at a molecular terminal or in a chain thereof an atomic group introduced thereinto and represented by formula (I): ##STR5## wherein E is O or S; and (d) 30 to 80 parts by weight, based on 100 parts by weight of the raw rubber, of carbon black.
Claim 2
Dependent Claim
123 words
A rubber composition for a tire tread comprising: (a) 25 to 55 parts by weight of a rubber selected from the group consisting of natural rubber and polyisoprene rubber; (b) 5 to 15 parts by weight of a halogenated butyl rubber; (c) 70 to 30 parts by weight of a styrenebutadiene copolymer rubber including 10 to 30 wt. % of bonded styrene units and 25 to 80% of 1,2-vinyl bonds in the butadiene units and having at a molecular terminal or in a chain thereof an atomic group introduced thereinto and represented by formula (I): ##STR5## wherein E is O or S; and (d) 30 to 80 parts by weight, based on 100 parts by weight of the raw rubber, of carbon black.
Claim 3
Dependent Claim
55 words
A rubber composition for a tire tread as claimed in claim 1, wherein 30 parts by weight of a rubber selected from the group consisting of polybutadiene rubber, acrylonitrile-butadiene copolymer rubber, and non-modified styrene-butadiene copolymer rubber is further incorporated, with the proviso that total rubber contents are in an amount of 100 part by weight.
Claim 4
Dependent Claim
58 words
A rubber composition for a tire tread as claimed in claim 1, wherein said styrene-butadiene copolymer rubber contains a branched polymer having branches bonded with a tin-butadienyl bond, the ratio of said branched polymer having branches bonded with a tin-butadienyl bond to said styrene-butadiene copolymer rubber without a tin-butadienyl bond being in the range of 0.1 to 4.0.
Claim 5
Dependent Claim
31 words
A rubber composition for a tire tread as claimed in claim 1, wherein said halogenated butyl rubber is selected from the group consisting of chlorinated butyl rubber and brominated butyl rubber.
Claim 6
Dependent Claim
47 words
The rubber composition as claimed in claim 1, wherein said carbon black has a specific surface area (N 2 SA) of 60 to 140 m 2 /g as measured by the nitrogen adsorption method and a dibutyl phtalate absorption (DBP absorption) of 100 to 150 ml/100 g.
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) | 1991-11-22 | 1992-05-23 | 1992-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-22 | 1996-05-23 | 1996-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-22 | 2000-05-23 | 2000-11-22 | $7700.00 | Window Closed / Lapsed |