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US4499228A
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Rubber compositions having improved crack growth resistance
Assignee: Bridgestone Corp
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Filing: 1983-06-23
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Granted: 1985-02-12
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Expires: 2003-06-23
Abstract
Abstract A rubber composition having an improved crack growth resistance is disclosed, which contains 1-40 wt % of granular bodies having an average particle diameter of 5-500 μm, which contain 2-40 wt % of micro short fibers having an average diameter of not more than 1 μm, an average length of 1-30 μm and an aspect ratio of not less than 8 and orientated in uniaxial or biaxial direction, and is random in the orientation axis of the micro short fiber between the granular bodies.
Inventors
- 👤 Masaki Ogawa
- 👤 Yasushi Hirata
- 👤 Akira Tsuchikura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:37
CPC Classifications
C; C08; C08L; C08L21/00; C08J; C08J5/00; C08J5/04; C08J5/0405; C08J5/046; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/08; C08J2307/00; C08J2309/00; C08J2321/00; C08K2201/00; C08K2201/016
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A rubber composition having an improved crack growth resistance, characterized by containing 1 to 40% by weight of a granular body having an average particle diameter of 5 to 500 μm, which contains 2 to 40% by weight of micro short fibers having an average diameter of not more than 1 μm, an average length of 1 to 30 μm and an aspect ratio of not less than 8 and orientated in uniaxial or biaxial direction, and being random in the orientation axis of the micro short fiber between these granular bodies.
Claim 2
Dependent Claim
92 words
A rubber composition having an improved crack growth resistance, characterized by containing 1 to 40% by weight of a granular body having an average particle diameter of 5 to 500 μm, which contains 2 to 40% by weight of micro short fibers having an average diameter of not more than 1 μm, an average length of 1 to 30 μm and an aspect ratio of not less than 8 and orientated in uniaxial or biaxial direction, and being random in the orientation axis of the micro short fiber between these granular bodies.
Claim 3
Dependent Claim
35 words
A rubber composition according to claim 1, wherein said micro short fiber is selected from micro short fiber of alkali metal titanate single crystal, micro short fiber of isotactic-polypropylene and micro short fiber of syndiotactic-1,2-polybutadiene.
Claim 4
Dependent Claim
15 words
A rubber composition according to claim 1, wherein said rubber composition comprises a diene rubber.
Claim 5
Dependent Claim
31 words
A rubber composition according to claim 3, wherein said diene rubber is selected from polyisoprene rubber, polybutadiene rubber, styrene-butadiene copolymer rubber, isoprene-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber and ethylene-propylene-diene terpolymer rubber.
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) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |