Patent US4515922A successfully refreshed from Google Patents.
US4515922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber compositions
Assignee: Bridgestone Corp
•
Filing: 1984-01-27
•
Granted: 1985-05-07
•
Expires: 2004-01-27
Abstract
Abstract A rubber composition having improved wet skid resistance and rolling resistance is disclosed, which comprises (A) 10-90% by weight of polybutadiene rubber having a content of cis-1,4-bond at least 80% and an average chain length of cis-1,4-bond of not less than 110, and (B) 10-90% by weight of random styrene-butadiene copolymer rubber obtained by copolymerization in the presence of an organic metal catalyst and having a content of bound styrene of not more than 40% by weight and a content of 1,2-bond in total butadiene unit of 30-95%.
Inventors
- 👤 Mitsuhiko Sakakibara
- 👤 Masao Yoshizawa
- 👤 Masaki Ogawa
- 👤 Yasushi Hirata
- 👤 Shigeru Tomihira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:10
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
79 words
A rubber composition comprising (A) 10-90% by weight of polybutadiene rubber having a content of cis-1,4-bond of at least 80% and an average chain length of cis-1,4-bond of not less than 110, and (B) 10-90% by weight of random styrene-butadiene copolymer rubber obtained by copolymerization in the presence of an organic metal catalyst and having a content of bound styrene of not more than 40% by weight and a content of 1,2-bond in the total butadiene unit of 30-95%.
Claim 2
Dependent Claim
79 words
A rubber composition comprising (A) 10-90% by weight of polybutadiene rubber having a content of cis-1,4-bond of at least 80% and an average chain length of cis-1,4-bond of not less than 110, and (B) 10-90% by weight of random styrene-butadiene copolymer rubber obtained by copolymerization in the presence of an organic metal catalyst and having a content of bound styrene of not more than 40% by weight and a content of 1,2-bond in the total butadiene unit of 30-95%.
Claim 3
Dependent Claim
16 words
A rubber composition according to claim 1, wherein said average chain length of cis-1,4-bond is 110-450.
Claim 4
Dependent Claim
21 words
A rubber composition according to claim 1, wherein said polybutadiene has a Mooney viscosity (ML 1+4 , 100° C.) of 20-150.
Claim 5
Dependent Claim
19 words
A rubber composition according to claim 1, wherein said rubber composition contains 20-80% by weight of said polybutadiene rubber.
Claim 6
Dependent Claim
17 words
A rubber composition according to claim 1, wherein said content of bound styrene is 5-30% by weight.
Claim 7
Dependent Claim
19 words
A rubber composition according to claim 1, wherein said content of 1,2-bond in the total butadiene unit is 45-95%.
Claim 8
Dependent Claim
24 words
A rubber composition according to claim 1, wherein said random styrene-butadiene copolymer rubber has a Mooney viscosity (ML 14 , 100° C.) of 20-150.
Claim 9
Dependent Claim
43 words
A rubber composition according to claim 1, wherein said copolymer rubber contains at least 10% by weight of a branched polymer obtained by subjecting the copolymer having a terminated lithium atom to a coupling reaction with a tin compound or a silicon compound.
Claim 10
Dependent Claim
21 words
A rubber composition according to claim 1, wherein said polybutadiene has a Mooney viscosity (ML 1+4 , 100° C.) of 20-80.
References Cited (Backward Citations)
US4107236A
Cited
US4370448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |