US5376438A
Expired / Lapsed
US
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Multilayer tire sidewall
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1993-02-08
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Granted: 1994-12-27
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Expires: 2013-02-08
Abstract
Abstract The invention is a multilayer tire sidewall having an outer layer prepared from a blend of isomonoolefin/para-alkylstyrene copolymer and general purpose rubbers. The inner layer comprises general purpose rubber. The resulting sidewall exhibit good ozone resistance and fatigue crack resistance as well as a reduction in staining and discloration.
Inventors
- 👤 Bernard Costemalle
- 👤 Douglas D. Flowers
- 👤 James V. Fusco
- 👤 Marcel Steurs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:14
CPC Classifications
C; C08; C08L; C08L21/00; B; B60; B60C; B60C1/00; B60C1/0025; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08L23/26; C08L23/28; C08L23/283; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/25; Y10T428/31504; Y10T428/31826; Y10T428/3183; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31924; Y10T428/31931
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
39 words
A multilayered tire sidewall comprising: a) an outerlayer comprising a blend of a copolymer of an isoolefin and a para-alkylstyrene and a unsaturated rubber; and b) an inner layer comprising a highly saturated rubber or blend of unsaturated rubbers.
Claim 2
Dependent Claim
39 words
A multilayered tire sidewall comprising: a) an outerlayer comprising a blend of a copolymer of an isoolefin and a para-alkylstyrene and a unsaturated rubber; and b) an inner layer comprising a highly saturated rubber or blend of unsaturated rubbers.
Claim 3
Dependent Claim
21 words
The tire sidewall of claim 1 wherein said copolymer comprise from about 0.5 to about 15 weight percent of said para-alkylstyrene.
Claim 4
Dependent Claim
11 words
The tire sidewall of claim 1 wherein said isoolefin is isobutylene.
Claim 5
Dependent Claim
11 words
The tire sidewall of claim 1 wherein said para-alkylstyrene is para-methylstyrene.
Claim 6
Dependent Claim
32 words
The tire sidewall of claim 1 wherein said high unsaturated rubber in said outer layer is selected from the group consisting of natural rubber, styrene butadiene rubber, polybutadiene rubber and mixtures thereof.
Claim 7
Dependent Claim
31 words
The tire sidewall of claim 1 wherein said highly unsaturated rubber of said inner layer is selected from the group consisting of natural rubber, styrenebutadiene rubber, polybutadiene rubber and mixtures thereof.
Claim 8
Dependent Claim
32 words
The tire sidewall of claim 1 wherein said outer layer has a thickness of between 0.8 and 2.0 mm and said inner layer has a thickness of between 1.0 and 2.0 mm.
Claim 9
Dependent Claim
14 words
The tire sidewall of claim 1 wherein said outer layer further comprises a filler.
Claim 10
Dependent Claim
21 words
The tire sidewall of claim 8 wherein said filler is selected from the group consisting of titanium dioxide, and carbon black.
Claim 11
Dependent Claim
61 words
A multilayer tire sidewall comprising: a) an outerlayer comprising 10 to 90 parts per hundred of total rubber of a random copolymer of an isomonoolefin and para-alkylstyrene and 90 to 10 parts per hundred of total rubber of a highly unsaturated rubber or a mixture of highly unsaturated rubber; and b) an inner layer comprising one or more highly unsaturated rubbers.
Claim 12
Dependent Claim
61 words
A multilayer tire sidewall comprising: a) an outerlayer comprising 10 to 90 parts per hundred of total rubber of a random copolymer of an isomonoolefin and para-alkylstyrene and 90 to 10 parts per hundred of total rubber of a highly unsaturated rubber or a mixture of highly unsaturated rubber; and b) an inner layer comprising one or more highly unsaturated rubbers.
Claim 13
Dependent Claim
24 words
The tire sidewall of claim 1 wherein said outer layer further comprises 1 to about 90 parts per hundred of total rubber halobutyl rubber.
Claim 14
Dependent Claim
24 words
The tire sidewall of claim 4 wherein said outer layer further comprises 1 to 40 parts per hundred of total rubber of ethylene-propylene-diene rubber.
Claim 15
Dependent Claim
14 words
The tire sidewall of claim 10 wherein said outer layer further comprises a filler.
Claim 16
Dependent Claim
11 words
The tire sidewall of claim 13 wherein filler comprises carbon black.
Claim 17
Dependent Claim
16 words
The tire sidewall of claim 10 wherein said isomonoolefin is butylene and said para-alkylstyrene is para-methylstyrene.
Claim 18
Dependent Claim
23 words
The tire sidewall of claim 10 wherein said random copolymer comprise 0.5 to 20 weight percent para-alkylstyrene and 1 to 2 percent halogen.
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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) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |