US5614580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire with silica reinforced tread
Assignee: Goodyear Tire and Rubber Co
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Filing: 1995-06-06
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Granted: 1997-03-25
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Expires: 2015-06-06
Abstract
Abstract The invention relates to a tire with a tread which is quantitatively reinforced with silica where the tread is composed of cis 1,4-polybutadiene rubber, a high vinyl polybutadiene rubber and, optionally a medium vinyl polybutadiene rubber. In one aspect, the tread rubber can also contain a minor amount of cis 1,4-polyisoprene natural rubber.
Inventors
- 👤 David J. Zanzig
- 👤 Paul H. Sandstrom
- 👤 Michael J. Crawford
- 👤 John J. A. Verthe
- 👤 Cheryl A. Losey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:42
CPC Classifications
C; C08; C08L; C08L21/00; C08K; C08K3/00; C08K3/34; C08K3/36; B; B60; B60C; B60C1/00; B60C1/0016; C08L9/00; C08L2205/00; C08L2205/02; C08L7/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
166 words
A pneumatic tire having a tread comprised of, (A) a combination of elastomers consisting essentially of cis 1,4-polybutadiene, medium vinyl polybutadiene and high vinyl polybutadiene elastomers and, based on 100 parts by weight rubber, as (i) about 10 to about 50 phr of cis 1,4-polybutadiene rubber, (ii) about 30 to about 70 phr of medium vinyl polybutadiene rubber having a vinyl content in a range of about 30 to about 60 percent and (iii) up to about 90 phr of a high vinyl polybutadiene rubber having a vinyl content in a range of about 60 to about 95; wherein the total of said medium and high vinyl polybutadiene rubbers is in a range of about 50 to about 90 phr, (B) about 50 to about 110 phr particulate silica, (C) and at least one silica coupler having a silane moiety reactive with silicon dioxide and a sulfur moiety reactive with said elastomer, in a weight ratio of silica to coupler of about 7/1 to about 15/1.
Claim 2
Dependent Claim
166 words
A pneumatic tire having a tread comprised of, (A) a combination of elastomers consisting essentially of cis 1,4-polybutadiene, medium vinyl polybutadiene and high vinyl polybutadiene elastomers and, based on 100 parts by weight rubber, as (i) about 10 to about 50 phr of cis 1,4-polybutadiene rubber, (ii) about 30 to about 70 phr of medium vinyl polybutadiene rubber having a vinyl content in a range of about 30 to about 60 percent and (iii) up to about 90 phr of a high vinyl polybutadiene rubber having a vinyl content in a range of about 60 to about 95; wherein the total of said medium and high vinyl polybutadiene rubbers is in a range of about 50 to about 90 phr, (B) about 50 to about 110 phr particulate silica, (C) and at least one silica coupler having a silane moiety reactive with silicon dioxide and a sulfur moiety reactive with said elastomer, in a weight ratio of silica to coupler of about 7/1 to about 15/1.
Claim 3
Dependent Claim
39 words
The tire of claim 1 where said silica is characterized by having a BET surface area in a range of about 100 to about 250 and a DBP absorption value in a range of about 200 to about 400.
Claim 4
Dependent Claim
18 words
The tire of claim 1 where the weight ratio of silica to carbon black is at least 10/1.
Claim 5
Dependent Claim
12 words
The tire of claim 1 where the said coupler is a bis-3-(triethoxysilylpropyl)tetrasulfide.
Claim 6
Dependent Claim
20 words
The tire of claim 1 where said tread also contains about 5 to about 20 phr cis 1,4-polyisoprene natural rubber.
Claim 7
Dependent Claim
49 words
The tire of claim 1 wherein said tread composition contains up to 50 phr of carbon black, wherein the weight ratio of silica to carbon black is at least 2/1 and the total of silica and carbon black is in a range of about 60 to about 120 phr.
Claim 8
Dependent Claim
167 words
A pneumatic tire having a tread comprised of, (A) a combination of elastomers consisting essentially of cis 1,4-polybutadiene, medium vinyl polybutadiene and high vinyl polybutadiene elastomers present and, based on 100 parts by weight rubber, as (i) about 10 to about 50 phr of cis 1,4-polybutadiene rubber, (ii) up to about 90 phr of medium vinyl polybutadiene rubber having a vinyl content in a range of about 30 to about 60 percent and (iii) about 40 to about 70 phr of a high vinyl polybutadiene rubber having a vinyl content in a range of about 60 to about 95; wherein the total of said medium and high vinyl polybutadiene rubbers is in a range of about 50 to about 90 phr, (B) about 50 to about 110 phr particulate silica, and (C) at least one silica coupler having a silane moiety reactive with silicon dioxide and a sulfur moiety reactive with said elastomer, in a weight ratio of silica to coupler of about 7/1 to about 15/1.
Claim 9
Dependent Claim
167 words
A pneumatic tire having a tread comprised of, (A) a combination of elastomers consisting essentially of cis 1,4-polybutadiene, medium vinyl polybutadiene and high vinyl polybutadiene elastomers present and, based on 100 parts by weight rubber, as (i) about 10 to about 50 phr of cis 1,4-polybutadiene rubber, (ii) up to about 90 phr of medium vinyl polybutadiene rubber having a vinyl content in a range of about 30 to about 60 percent and (iii) about 40 to about 70 phr of a high vinyl polybutadiene rubber having a vinyl content in a range of about 60 to about 95; wherein the total of said medium and high vinyl polybutadiene rubbers is in a range of about 50 to about 90 phr, (B) about 50 to about 110 phr particulate silica, and (C) at least one silica coupler having a silane moiety reactive with silicon dioxide and a sulfur moiety reactive with said elastomer, in a weight ratio of silica to coupler of about 7/1 to about 15/1.
Claim 10
Dependent Claim
18 words
The tire of claim 7 where the weight ratio of silica to carbon black is at least 10/1.
Claim 11
Dependent Claim
12 words
The tire of claim 7 where the said coupler is a bis-3-(triethoxysilylpropyl)tetrasulfide.
Claim 12
Dependent Claim
20 words
The tire of claim 7 where said tread also contains about 5 to about 20 phr cis 1,4-polyisoprene natural rubber.
Claim 13
Dependent Claim
49 words
The tire of claim 7 wherein said tread composition contains up to 50 phr of carbon black, wherein the weight ratio of silica to carbon black is at least 2/1 and the total of silica and carbon black is in a range of about 60 to about 120 phr.
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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) | 2000-03-24 | 2000-09-23 | 2001-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-24 | 2004-09-23 | 2005-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-24 | 2008-09-23 | 2009-03-25 | $7700.00 | Window Closed / Lapsed |