US4555548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber composition for tire treads
Assignee: Zeon Corp
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Filing: 1984-08-23
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Granted: 1985-11-26
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Expires: 2004-08-23
Abstract
Abstract A rubber composition for tire treads, comprising [I] 10 to 90% by weight of a styrene-butadiene copolymer rubber containing not more than 40% by weight of bound styrene and having bonded to a carbon atom of the rubber molecular chain at least 0.1 mole, per mole of the rubber molecular chain, of an atomic grouping represented by the following formula ##STR1## wherein: X represents O or S, R 1 and R 2 are identical or different and each represents an amino group or an alkyl-substituted amino group, R 3 and R 4 are identical or different and each represents a substituent other than the above-mentioned, m, p and q each represent O or an integer of at least 1, n represents an integer of at least 1, m+p=0-5, and n+q=1-5, and [II] 90 to 10% by weight of at least one rubber selected from the group consisting of styrene-butadiene copolymer rubber having a bound styrene content of not more than 40% by weight and polyisoprene rubber.
Inventors
- 👤 Akio Ueda
- 👤 Shuichi Akita
- 👤 Takeshi Chida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:19
CPC Classifications
C; C08; C08L; C08L7/00; B; B60; B60C; B60C1/00; B60C1/0016; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08L21/00; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
189 words
A rubber composition for tire treads, said composition comprising (I) 10 to 90% by weight of a styrene-butadiene copolymer rubber containing not more than 40% by weigtht of bound styrene and having bonded to a carbon atom of the rubber molecular chain at least 0.1 mole and up to 5 moles, per mole of the rubber molecular chain, of an atomic grouping represented by the following formula ##STR4## wherein: X represents O or S, R 1 and R 2 are identical or different and each represents an amino group or an alkyl-substituted amino group, R 3 and R 4 are identical or different and each represents a substituent other than an amino group or alkyl-substituted amino group, m, p and q represent O or an integer of at least 1, n represents an integer of at least 1, m+p=0-5 and n+q=1-5, and (II) 90 to 10% by weight of at least one rubber selected from the group consisting of styrene-butadiene copolymer rubber having a bonded styrene content of not more than 40% by weight, natural rubber and synthetic polyisoprene rubber having a cis 1,4-linkage content of at least 90%.
Claim 2
Dependent Claim
189 words
A rubber composition for tire treads, said composition comprising (I) 10 to 90% by weight of a styrene-butadiene copolymer rubber containing not more than 40% by weigtht of bound styrene and having bonded to a carbon atom of the rubber molecular chain at least 0.1 mole and up to 5 moles, per mole of the rubber molecular chain, of an atomic grouping represented by the following formula ##STR4## wherein: X represents O or S, R 1 and R 2 are identical or different and each represents an amino group or an alkyl-substituted amino group, R 3 and R 4 are identical or different and each represents a substituent other than an amino group or alkyl-substituted amino group, m, p and q represent O or an integer of at least 1, n represents an integer of at least 1, m+p=0-5 and n+q=1-5, and (II) 90 to 10% by weight of at least one rubber selected from the group consisting of styrene-butadiene copolymer rubber having a bonded styrene content of not more than 40% by weight, natural rubber and synthetic polyisoprene rubber having a cis 1,4-linkage content of at least 90%.
Claim 3
Dependent Claim
27 words
The composition of claim 1 comprising 30 to 90% by weight of the styrene-butadiene copolymer rubber [I] and 70 to 10% by weight of the rubber [II].
Claim 4
Dependent Claim
40 words
The composition of claim 1 which further comprises (III) 5 to 50 parts by weight per 100 parts by weight of the rubbers (I) and (II) combined of a polybutadiene rubber having a 1,2-linkage content of not more than 20%.
Claim 5
Dependent Claim
29 words
The composition of claim 1 wherein R 3 and R 4 are the same or different and each represents a hydrocarbon group, an alkoxy group or a halogen atom.
Claim 6
Dependent Claim
43 words
The composition of claim 1 wherein the atomic grouping represented by the formula is derived from a benzophenone or thiobenzophenone compound selected from the group consisting of 4-aminobenzophenone, 4-dimethylaminobenzophenone, 4-dimethylamino-4'-methylbenzophenone, 4,4'-diaminobenzophenone, 4,4'-bis(dimethylamino)benzophenone, 4,4'-bis(diethylamino)benzophenone, 4,4'-bis(ethylamino)benzophenone, 3,3'-dimethyl-4,4'-bis(diethylamino)benzophenone, 3,3'-dimethoxy-4,4'-bis(dimethylamino)benzophenone, 3,3',5,5'-tetraaminobenzophenone, 2,4,6-triaminobenzophenone, 3,3',5,5'-tetra(diethylamino)benzophenone and the corresponding thiobenzophenones.
Claim 7
Dependent Claim
25 words
The composition of claim 5 wherein at least 0.3 mole of the atomic grouping is bonded to a carbon atom of the rubber molecular chain.
Claim 8
Dependent Claim
38 words
The composition of claim 1 wherein the styrene-butadiene copolymer rubber of component (I) has at least 3 percent by weight of bound styrene and the 1,2 linkage content of butadiene units thereof is from 10 to 80 mole%.
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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) | 1988-11-25 | 1989-05-27 | 1989-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-25 | 1993-05-27 | 1993-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-25 | 1997-05-27 | 1997-11-26 | $7700.00 | Window Closed / Lapsed |