US4285381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable composition for hard rubber and the use thereof
Assignee: Sumitomo Rubber Industries Ltd
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Filing: 1980-06-10
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Granted: 1981-08-25
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Expires: 2000-06-10
Abstract
Abstract A curable composition comprising (1) at least one rubber selected from the group consisting of natural rubber, a diene rubber and a diene copolymer rubber, (2) a sulfide resin as a curing agent having the following general formula: ##STR1## wherein X is methylene group, ethylene group, --S-- or --S--S--, R 1 and R 2 are independently a C 1-10 alkyl or alkylene group, Y 1 and Y 2 are independently the residue of a phenol compound, p is an integer of 2 to 8, and n is an integer of 2 to 5, (3) a phenolic thermosetting resin and (4) a hardener for hardening said thermosetting resin. The composition shows a low viscosity upon milling and also does not take place scorching and blooming, and can provide a cured rubber having a high dynamic modulus of elasticity with improved workability and processability. The cured rubber is suitable for use in radial tires as bead filler rubber.
Inventors
- 👤 Hiroshi Furukawa
- 👤 Takehiko Tsuyuri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:13
CPC Classifications
C; C08; C08L; C08L21/00; B; B60; B60C; B60C15/00; B60C15/06; B60C15/0603; B60C15/0607; C08G; C08G75/00; C08G75/14; C08G75/16; C08G8/00; C08G8/04; C08G8/08; C08G8/24; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/35; C08K5/36; C08K5/37; C08K5/375; C08L61/00; C08L61/04; C08L7/00; C08L81/00; C08L81/04; Y; Y10; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10837; Y10T152/10846
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
A radial tire comprising a carcass ply composed of cords arranged in the radial direction of tire, the both end portions of the carcass ply being turned up at a bead to fasten, and a bead filler being positioned between the carcass ply and the turned-up end portion thereof and extending from a location just above a bead wire toward the side wall of the tire, said radial tire being improved in that said bead filler is made of a cured composition comprising (1) at least one rubber selected from the group consisting of natural rubber, a diene rubber and a diene copolymer rubber, (2) a sulfide resin as a curing agent having the following general formula: ##STR8## wherein X is methylene group, ethylene group, --S-- or --S--S--, R 1 and R 2 are independently a C 1-10 alkyl or alkylene group, Y 1 and Y 2 are independently the residue of a phenol compound, p is an integer of 2 to 8, and n is an integer of 2 to 5, (3) a phenolic thermosetting resin and (4) a hardener for hardening said thermosetting resin.
Claim 2
Dependent Claim
186 words
A radial tire comprising a carcass ply composed of cords arranged in the radial direction of tire, the both end portions of the carcass ply being turned up at a bead to fasten, and a bead filler being positioned between the carcass ply and the turned-up end portion thereof and extending from a location just above a bead wire toward the side wall of the tire, said radial tire being improved in that said bead filler is made of a cured composition comprising (1) at least one rubber selected from the group consisting of natural rubber, a diene rubber and a diene copolymer rubber, (2) a sulfide resin as a curing agent having the following general formula: ##STR8## wherein X is methylene group, ethylene group, --S-- or --S--S--, R 1 and R 2 are independently a C 1-10 alkyl or alkylene group, Y 1 and Y 2 are independently the residue of a phenol compound, p is an integer of 2 to 8, and n is an integer of 2 to 5, (3) a phenolic thermosetting resin and (4) a hardener for hardening said thermosetting resin.
Claim 3
Dependent Claim
28 words
The radial tire of claim 1, wherein said bead filler extends to the central portion of the side wall with a gradually decreasing thickness of the bead filler.
Claim 4
Dependent Claim
48 words
The radial tire of claim 1, further comprising a clinch-apex having a height of 0.45 to 0.75 time the height of the bead filler, said clinch-apex being positioned at the outside in the axial direction of the turned-up end portion of the carcass ply in close vicinity thereto.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |