US4567225A
Expired / Lapsed
US
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Rubber composition for tire treads
Assignee: Yokohama Rubber Co Ltd
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Filing: 1985-07-05
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Granted: 1986-01-28
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Expires: 2005-07-05
Abstract
Abstract A rubber composition for tire tread, comprising natural rubber and/or polyisoprene rubber and polybutadiene rubber, which polybutadiene rubber having a 1,2-bond unit content in the range of 40 to 90 mol % and having a specific functional group contained in the molecular chain thereof.
Inventors
- 👤 Makoto Misawa
- 👤 Tetsuya Mizoguchi
- 👤 Kinya Kawakami
- 👤 Asahiro Ahagon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:35
CPC Classifications
C; C08; C08L; C08L7/00; B; B60; B60C; B60C1/00; B60C1/0016; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08L15/00; C08L9/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
181 words
A rubber composition for tire treads, comprising a total of 100 parts by weight of rubber components including 50 to 90 parts by weight of natural rubber and/or polyisoprene rubber and 10 to 50 parts by weight of polybutadiene rubber, which rubber composition is characterized by said polybutadiene rubber having a 1,2-bond unit content in the range of 40 to 90 mol % and having at least one atomic group per one molecular chain of the polybutadiene rubber so that there is 0.05 to 1 part by weight of said atomic group per 100 parts by weight of the polybutadiene rubber on the average, said atomic group being represented by the following formula: ##STR4## wherein R 1 and R 2 each denote a hydrogen atom or a substituent selected from the group consisting of an amino group, an alkylamino group, a dialkylamino group and combinations thereof and m and n each denote an integer in the range of 1 to 5, said atomic group being joined in the form of a carbon-carbon bond to the molecular chain of said polybutadiene rubber.
Claim 2
Dependent Claim
181 words
A rubber composition for tire treads, comprising a total of 100 parts by weight of rubber components including 50 to 90 parts by weight of natural rubber and/or polyisoprene rubber and 10 to 50 parts by weight of polybutadiene rubber, which rubber composition is characterized by said polybutadiene rubber having a 1,2-bond unit content in the range of 40 to 90 mol % and having at least one atomic group per one molecular chain of the polybutadiene rubber so that there is 0.05 to 1 part by weight of said atomic group per 100 parts by weight of the polybutadiene rubber on the average, said atomic group being represented by the following formula: ##STR4## wherein R 1 and R 2 each denote a hydrogen atom or a substituent selected from the group consisting of an amino group, an alkylamino group, a dialkylamino group and combinations thereof and m and n each denote an integer in the range of 1 to 5, said atomic group being joined in the form of a carbon-carbon bond to the molecular chain of said polybutadiene rubber.
Claim 3
Dependent Claim
63 words
A rubber composition according to claim 1, wherein polybutadiene having a 1,2-bond unit content of not more than 20% or a styrene-butadiene copolymer rubber having a bound styrene content in the range of 18 to 28% by weight is additionally incorporated in an amount not more than 40 parts by weight based on a total of 100 parts by weight of rubber components.
Claim 4
Dependent Claim
49 words
A rubber composition according to claim 1, wherein a softening agent is incorporated in an amount of 1 to 40 parts by weight and carbon black in an amount of 5 to 70 parts by weight, respectively based on a total of 100 parts by weight of rubber components.
Claim 5
Dependent Claim
49 words
A rubber composition according to claim 2, wherein a softening agent is incorporated in an amount of 1 to 40 parts by weight and carbon black in an amount of 5 to 70 parts by weight, respectively based on a total of 100 parts by weight of rubber components.
Claim 6
Dependent Claim
43 words
A rubber composition according to claim 1, wherein said polybutadiene rubber has been obtained by polymerizing butadiene in the presence of an alkali metal-based catalyst and, after completion of the polymerization, adding a benzophenone to the polybutadiene rubber solution obtained by said polymerization.
Claim 7
Dependent Claim
43 words
A rubber composition according to claim 2, wherein said polybutadiene rubber has been obtained by polymerizing butadiene in the presence of an alkali metal-based catalyst and, after completion of the polymerization, adding a benzophenone to the polybutadiene rubber solution obtained by said polymerization.
Claim 8
Dependent Claim
43 words
A rubber composition according to claim 3, wherein said polybutadiene rubber has been obtained by polymerizing butadiene in the presence of an alkali metal-based catalyst and, after completion of the polymerization, adding a benzophenone to the polybutadiene rubber solution obtained by said polymerization.
Claim 9
Dependent Claim
43 words
A rubber composition according to claim 4, wherein said polybutadiene rubber has been obtained by polymerizing butadiene in the presence of an alkali metal-based catalyst and, after completion of the polymerization, adding a benzophenone to the polybutadiene rubber solution obtained by said polymerization.
Claim 10
Dependent Claim
23 words
A rubber composition according to claim 5, wherein said alkali metal-based catalyst has as a basal material thereof lithium, sodium, rubidium or cesium.
Claim 11
Dependent Claim
23 words
A rubber composition according to claim 6, wherein said alkali metal-based catalyst has as a basal material thereof lithium, sodium, rubidium or cesium.
Claim 12
Dependent Claim
23 words
A rubber composition according to claim 7, wherein said alkali metal-based catalyst has as a basal material thereof lithium, sodium, rubidium or cesium.
Claim 13
Dependent Claim
23 words
A rubber composition according to claim 8, wherein said alkali metal-based catalyst has as a basal material thereof lithium, sodium, rubidium or cesium.
Claim 14
Dependent Claim
17 words
A rubber composition according to claim 5, wherein said benzophenone is 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)-benzophenone, 4,4'-bis(dibutylamino)-benzophenone, 4,4'-diaminobenzophenone or 4-dimethylaminobenzophenone.
Claim 15
Dependent Claim
17 words
A rubber composition according to claim 6, wherein said benzophenone is 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)-benzophenone, 4,4'-bis(dibutylamino)-benzophenone, 4,4'-diaminobenzophenone or 4-dimethylaminobenzophenone.
Claim 16
Dependent Claim
17 words
A rubber composition according to claim 7, wherein said benzophenone is 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)-benzophenone, 4,4'-bis(dibutylamino)-benzophenone, 4,4'-diaminobenzophenone or 4-dimethylaminobenzophenone.
Claim 17
Dependent Claim
17 words
A rubber composition according to claim 8, wherein said benzophenone is 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)-benzophenone, 4,4'-bis(dibutylamino)-benzophenone, 4,4'-diaminobenzophenone or 4-dimethylaminobenzophenone.
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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |