US5328949A
Expired / Lapsed
US
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Silica reinforced rubber composition field
Assignee: Goodyear Tire and Rubber Co
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Filing: 1993-12-02
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Granted: 1994-07-12
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Expires: 2013-12-02
Abstract
Abstract A rubber composition comprised of elastomer, silica, optionally carbon black and a silica coupler comprised of dithiodipropionic acid.
Inventors
- 👤 Paul H. Sandstrom
- 👤 Richard G. Bauer
- 👤 Donald J. Burlett
- 👤 Mark S. Sinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:24
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; C08K3/00; C08K3/34; C08K3/36; C08K5/54; C08K5/548; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 5 to about 90 phr particulate silica, (C) about zero to about 80 phr carbon black, and (D) a silica coupler selected from (i) dithiodipropionic acid or from (ii) a combination of about 95 to about 25 weight percent dithiodipropionic acid and, correspondingly, about 5 to about 75 weight percent bis- (3-triethoxysilylpropyl) tetrasulfide; wherein the weight ratio of said silica coupler to silica is in a range of about 0.01/1 to about 0.2/1; wherein the weight ratio of silica to carbon black, where the rubber composition contains carbon black, is at least about 0.1/1 and wherein the total of silica and carbon black, where the rubber composition contains carbon black, is in a range of about 30 to about 120.
Claim 2
Dependent Claim
138 words
A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 5 to about 90 phr particulate silica, (C) about zero to about 80 phr carbon black, and (D) a silica coupler selected from (i) dithiodipropionic acid or from (ii) a combination of about 95 to about 25 weight percent dithiodipropionic acid and, correspondingly, about 5 to about 75 weight percent bis- (3-triethoxysilylpropyl) tetrasulfide; wherein the weight ratio of said silica coupler to silica is in a range of about 0.01/1 to about 0.2/1; wherein the weight ratio of silica to carbon black, where the rubber composition contains carbon black, is at least about 0.1/1 and wherein the total of silica and carbon black, where the rubber composition contains carbon black, is in a range of about 30 to about 120.
Claim 3
Dependent Claim
15 words
The rubber composition of claim 1 wherein the silica coupler consists essentially of dithiodipropionic acid.
Claim 4
Dependent Claim
15 words
The rubber composition of claim 1 wherein the silica coupler consists essentially of 3,3'-dithiodipropionic acid.
Claim 5
Dependent Claim
33 words
The rubber composition of claim 1 wherein the silica coupler is a combination of about 95 to about 25 weight percent dithiodipropionic acid and, correspondingly, about 5 to about 75 weight percent bis-(3-triethoxysilylpropyl)tetrasulfide.
Claim 6
Dependent Claim
13 words
The rubber composition of claim 4 where said dithiodipropionic acid is 3,3'-dithiodipropionic acid.
Claim 7
Dependent Claim
53 words
The rubber composition of claim 1 wherein the diene based elastomer is selected from at least one of cis 1,4-polyisoprene rubber, 3,4-polyisoprene rubber, styrene/butadiene copolymer rubbers, styrene/isoprene/butadiene terpolymer rubbers, cis 1,4-polybutadiene rubber, and emulsion polymerization prepared styrene/butadiene/acrylonitrile terpolymer rubber and butadiene/acrylonitrile copolymer rubber; wherein said rubber composition is exclusive of any organo-cobalt compound.
Claim 8
Dependent Claim
55 words
The rubber composition of claim 1 wherein the silica is characterized by having a BET surface area in a range of about 50 to about 300 square meters per gram and a dibutylphthalate (DBP) absorption value in a range of about 150 to about 300; wherein said rubber composition is exclusive of any organo-cobalt compound.
Claim 9
Dependent Claim
55 words
The rubber composition of claim 3 wherein the silica is characterized by having a BET surface area in a range of about 50 to about 300 square meters per gram and a dibutylphthalate (DBP) absorption value in a range of about 150 to about 300; wherein said rubber composition is exclusive of any organo-cobalt compound.
Claim 10
Dependent Claim
55 words
The rubber composition of claim 4 wherein the silica is characterized by having a BET surface area in a range of about 50 to about 300 square meters per gram and a dibutylphthalate (DBP) absorption value in a range of about 150 to about 300; wherein said rubber composition is exclusive of any organo-cobalt compound.
Claim 11
Dependent Claim
172 words
A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 25 to about 90 phr particulate silica, (C) up to about 30 phr carbon black, and (D) a silica coupler selected from (i) 3,3-dithiodipropionic acid or from (ii) about 95 to about 55 weight percent 3,3-dithiodipropionic acid and, correspondingly, about 5 to about 45 weight percent bis-(3-triethoxysilylpropyl)tetrasulfide; wherein the weight ratio of said silica coupler to silica is in a range of about 0.01/1 to about 0.2/1; wherein the weight ratio of silica to carbon black is in a range of about 3/1 to about 30/1; wherein the total of silica and carbon black is in a range of about 30 to about 120; wherein the silica is characterized by having a BET surface area in a range of about 50 to about 300 square meters per gram and a dibutylphthalate (DBP) absorption value in a range of about 150 to about 300; and wherein said rubber composition is exclusive of any organo-cobalt compound.
Claim 12
Dependent Claim
172 words
A rubber composition comprised of (A) 100 parts by weight of at least one diene-based elastomer, (B) about 25 to about 90 phr particulate silica, (C) up to about 30 phr carbon black, and (D) a silica coupler selected from (i) 3,3-dithiodipropionic acid or from (ii) about 95 to about 55 weight percent 3,3-dithiodipropionic acid and, correspondingly, about 5 to about 45 weight percent bis-(3-triethoxysilylpropyl)tetrasulfide; wherein the weight ratio of said silica coupler to silica is in a range of about 0.01/1 to about 0.2/1; wherein the weight ratio of silica to carbon black is in a range of about 3/1 to about 30/1; wherein the total of silica and carbon black is in a range of about 30 to about 120; wherein the silica is characterized by having a BET surface area in a range of about 50 to about 300 square meters per gram and a dibutylphthalate (DBP) absorption value in a range of about 150 to about 300; and wherein said rubber composition is exclusive of any organo-cobalt compound.
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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) | 1997-07-11 | 1998-01-10 | 1998-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-11 | 2002-01-10 | 2002-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-11 | 2006-01-10 | 2006-07-12 | $7700.00 | Window Closed / Lapsed |