US4421899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic tires having improved durability
Assignee: Bridgestone Corp
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Filing: 1982-04-28
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Granted: 1983-12-20
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Expires: 2002-04-28
Abstract
Abstract A steel cord futed pneumatic tire having improved durability is disclosed. In this tire, a coating rubber for the belt and/or carcass ply comprises a rubber composition containing 2 to 10 parts by weight of a polysulfide polymer having the following general formula (I): -(R-Sx)n, (I) wherein x is 3-6, R is -(CH2-CH2-O)mCH2-CH2-, m is 3-5 and n is 10-300, as a vulcanizing agent based on 100 parts by weight of rubber hydrocarbon consisting of at least 30% by weight of natural rubber or synthetic polyisoprene rubber or blends thereof.
Inventors
- 👤 Noboru Yamazaki
- 👤 Michio Okuyama
- 👤 Seisuke Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; B; B60; B60C; B60C1/00; B60C1/0041; C08G; C08G75/00; C08G75/14; C08L; C08L21/00; C08L7/00; C08L9/00; C08L9/06; B60C2001/0066; C08L81/00; C08L81/02; C08L81/04; Y; Y10; Y10S; Y10S152/00; Y10S152/905; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/1081
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
117 words
A steel cord belted radial pneumatic tire having improved durability, comprising steel cords and a rubber composition comprising a polysulfide polymer, having a polyether bond therein, of the general formula I: --R--S.sub.x).sub.n, (I) wherein x is 3 to 6, R is --CH 2 --CH 2 --O) m --CH 2 , m is 3 to 5 and n is 10 to 300, in an amount, an sulfur equivalent, of 2.0 to 10 parts by weight per 100 parts by weight of a rubber hydrocarbon consisting of at least 30% by weight of rubber selected from the group consisting of natural rubber, synthetic polyisoprene rubber and blends thereof, used as a coating rubber for the belt and/or carcass ply.
Claim 2
Dependent Claim
117 words
A steel cord belted radial pneumatic tire having improved durability, comprising steel cords and a rubber composition comprising a polysulfide polymer, having a polyether bond therein, of the general formula I: --R--S.sub.x).sub.n, (I) wherein x is 3 to 6, R is --CH 2 --CH 2 --O) m --CH 2 , m is 3 to 5 and n is 10 to 300, in an amount, an sulfur equivalent, of 2.0 to 10 parts by weight per 100 parts by weight of a rubber hydrocarbon consisting of at least 30% by weight of rubber selected from the group consisting of natural rubber, synthetic polyisoprene rubber and blends thereof, used as a coating rubber for the belt and/or carcass ply.
Claim 3
Dependent Claim
37 words
A steel cord belted radial pneumatic tire as in claim 1, wherein said rubber hydrocarbon additionally contains 0 to 70% by weight of a rubber selected from the group consisting of styrene-butadiene copolymer rubber and polybutadiene rubber.
References Cited (Backward Citations)
US3505258A
Cited
US3648748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |