US5447971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire with silica reinforced tread
Assignee: Goodyear Tire and Rubber Co
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Filing: 1994-10-12
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Granted: 1995-09-05
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Expires: 2014-10-12
Abstract
Abstract The invention relates to a tire with a tread which is reinforced with silica where the tread rubbers are of a blend of emulsion SBR with medium to high styrene content, isoprene/butadiene copolymer rubber, cis 1,4-polybutadiene rubber and natural rubber.
Inventors
- 👤 Jean Bergh
- 👤 Marc Junio
- 👤 Jean-Claude J. M. Kihn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:25
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08L; C08L9/00; C08L9/06; C08K5/00; C08K5/54; C08L7/00; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
138 words
A pneumatic tire is having a sulfur vulcanized tread comprised of, based on 100 parts by weight rubber, (A) diene-based elastomer consisting essentially of (i) about 10 to about 80 phr of emulsion polymerization prepared styrene/butadiene copolymer rubber containing about 30 to about 45 percent styrene, (ii) about 10 to about 60 phr of an isoprene/butadiene copolymer rubber containing about 30 to about 70 weight percent isoprene, (iii) about 15 to about 30 phr of a cis 1,4-polybutadiene rubber, and (iv) about 0 to about 15 phr of cis 1,4-polyisoprene natural rubber, (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 2
Dependent Claim
138 words
A pneumatic tire is having a sulfur vulcanized tread comprised of, based on 100 parts by weight rubber, (A) diene-based elastomer consisting essentially of (i) about 10 to about 80 phr of emulsion polymerization prepared styrene/butadiene copolymer rubber containing about 30 to about 45 percent styrene, (ii) about 10 to about 60 phr of an isoprene/butadiene copolymer rubber containing about 30 to about 70 weight percent isoprene, (iii) about 15 to about 30 phr of a cis 1,4-polybutadiene rubber, and (iv) about 0 to about 15 phr of cis 1,4-polyisoprene natural rubber, (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 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 200 and a DBP absorption value in a range of about 200 to about 400.
Claim 4
Dependent Claim
43 words
The tire of claim 1 wherein the said tread contains up to 50 phr carbon black, the weight ratio of silica to carbon black is at least 1/1 and the total of silica and carbon black is about 60 to about 120 phr.
Claim 5
Dependent Claim
18 words
The tire of claim 3 where the weight ratio of silica to carbon black is at least 10/1.
Claim 6
Dependent Claim
32 words
The tire of claim 1 where the said isoprene/butadiene copolymer rubber is characterized, in its uncured state by having a Tg in a range of about -20° C. to about -50° C.
Claim 7
Dependent Claim
12 words
The tire of claim 1 where the said coupler is a bis-3-(triethoxysilylpropyl)tetrasulfide.
Claim 8
Dependent Claim
128 words
A pneumatic tire having a sulfur vulcanized tread comprised of, based on 100 parts by weight rubber, (A) diene-based elastomers consisting essentially of (i) about 15 to about 60 phr of emulsion polymerization prepared styrene/butadiene copolymer rubber containing about 30 to about 45 percent styrene, (ii) about 35 to about 50 phr of an isoprene/butadiene copolymer rubber containing about 30 to about 70 weight percent isoprene, C(ii) about 15 to about 30 phr of a cis 1,4-polybutadiene rubber, and (iv) about 5 to about 15 phr of cis 1,4-polyisoprene natural rubber, (B) about 60 to about 110 phr particulate silica, and (C) at least one silica coupler having a silane moiety reactive with said elastomer in a weight ratio of silica to coupler of 7/1 to about 15/1.
Claim 9
Dependent Claim
128 words
A pneumatic tire having a sulfur vulcanized tread comprised of, based on 100 parts by weight rubber, (A) diene-based elastomers consisting essentially of (i) about 15 to about 60 phr of emulsion polymerization prepared styrene/butadiene copolymer rubber containing about 30 to about 45 percent styrene, (ii) about 35 to about 50 phr of an isoprene/butadiene copolymer rubber containing about 30 to about 70 weight percent isoprene, C(ii) about 15 to about 30 phr of a cis 1,4-polybutadiene rubber, and (iv) about 5 to about 15 phr of cis 1,4-polyisoprene natural rubber, (B) about 60 to about 110 phr particulate silica, and (C) at least one silica coupler having a silane moiety reactive with said elastomer in a weight ratio of silica to coupler of 7/1 to about 15/1.
Claim 10
Dependent Claim
39 words
The tire of claim 7 where said silica is characterized by having a BET surface area in a range of about 100 to about 200 and a DBP absorption value in a range of about 200 to about 400.
Claim 11
Dependent Claim
43 words
The tire of claim 7 wherein the said tread contains up to 50 phr carbon black, the weight ratio of silica to carbon black is at least 4/1 and the total of silica and carbon black is about 70 to about 120 phr.
Claim 12
Dependent Claim
32 words
The tire of claim 7 where the said isoprene/butadiene copolymer rubber is characterized, in its uncured state by having a Tg in a range of about -20° C. to about -50° C.
Claim 13
Dependent Claim
12 words
The tire of claim 7 where the said coupler is a bis-3-(triethoxysilylpropyl)tetrasulfide.
Claim 14
Dependent Claim
137 words
A pneumatic tire having a sulfur vulcanized tread comprised of, based on 100 parts by weight rubber, (A) diene-based elastomers consisting essentially of (i) about 15 to about 60 phr of emulsion polymerization prepared styrene/butadiene copolymer rubber containing about 30 to about 45 percent styrene, (ii) about 35 to about 50 phr of an isoprene/butadiene copolymer rubber containing about 40 to about 60 weight percent isoprene, (iii) about 15 to about 30 phr of a cis 1,4-polybutadiene rubber, and (iv) about 5 to about 15 phr of cis 1,4-polyisoprene natural rubber, (B) about 60 to about 85 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 15
Dependent Claim
137 words
A pneumatic tire having a sulfur vulcanized tread comprised of, based on 100 parts by weight rubber, (A) diene-based elastomers consisting essentially of (i) about 15 to about 60 phr of emulsion polymerization prepared styrene/butadiene copolymer rubber containing about 30 to about 45 percent styrene, (ii) about 35 to about 50 phr of an isoprene/butadiene copolymer rubber containing about 40 to about 60 weight percent isoprene, (iii) about 15 to about 30 phr of a cis 1,4-polybutadiene rubber, and (iv) about 5 to about 15 phr of cis 1,4-polyisoprene natural rubber, (B) about 60 to about 85 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 16
Dependent Claim
39 words
The tire of claim 12, where said silica is characterized by having a BET surface area in a range of about 120 to about 180 and a DBP absorption value in a range of about 250 to about 300.
Claim 17
Dependent Claim
16 words
The tire of claim 12, where said silica is characterized by having a substantially spherical shape.
Claim 18
Dependent Claim
43 words
The tire of claim 12 wherein the said tread contains up to 50 phr carbon black, the weight ratio of silica to carbon black is at least 4/1 and the total of silica and carbon black is about 70 to about 120 phr.
Claim 19
Dependent Claim
32 words
The tire of claim 12 where the said isoprene/butadiene copolymer rubber is characterized, in its uncured state by having a Tg in a range of about -20° C. to about -50° C.
Claim 20
Dependent Claim
12 words
The tire of claim 12 where the said coupler is a bis-3-(triethoxysilylpropyl)tetrasulfide.
Claim 21
Dependent Claim
17 words
The tire of claim 15 where the ratio of silica to carbon black is at least 10/1.
Claim 22
Dependent Claim
64 words
The tire of claim 12 where said silica is characterized by having a BET surface area in a range of about 120 to about 180 and a DBP absorption value in a range of about 250 to about 300 and a substantially spherical shape; where the said coupler is a bis-3-(triethoxysilylpropyl)tetrasulfide and where the ratio of silica to carbon black is at least 10/1.
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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) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-04 | 2003-03-06 | 2003-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-04 | 2007-03-06 | 2007-09-05 | $7700.00 | Window Closed / Lapsed |