US5580930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber composition for tires
Assignee: Bridgestone Corp
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Filing: 1995-06-06
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Granted: 1996-12-03
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Expires: 2015-06-06
Abstract
Abstract Diene polymers having a high content of trans-1,4 addition and two distinct melting points in the ranges of 30° C. to 60° C. and 70° C. to 130° C. are useful as additives to tire rubbers to improve processability by reducing compound Mooney viscosity and reducing the shrinkage of various compound stocks.
Inventors
- 👤 Jung W. Kang
- 👤 Thomas J. Lynch
- 👤 Jason T. Poulton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:04
CPC Classifications
C; C08; C08L; C08L7/00; C08L9/00; C08L9/06; C08L2205/00; C08L2205/02; Y; Y10; Y10T; Y10T152/00; Y10T152/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
A rubbery composition comprised of a blend of 70 to 95 parts by weight of at least one diene rubber selected from natural rubber, cis 1,4-polyisoprene rubber, styrene-butadiene copolymer rubber, styrene-isoprene-butadiene rubber and 5 to 30 parts by weight of a trans 1,4-polybutadiene having a first melting point ranging between 30° C. to 60° C. and a second melting point ranging between 70° C. to 130° C.
Claim 2
Dependent Claim
67 words
A rubbery composition comprised of a blend of 70 to 95 parts by weight of at least one diene rubber selected from natural rubber, cis 1,4-polyisoprene rubber, styrene-butadiene copolymer rubber, styrene-isoprene-butadiene rubber and 5 to 30 parts by weight of a trans 1,4-polybutadiene having a first melting point ranging between 30° C. to 60° C. and a second melting point ranging between 70° C. to 130° C.
Claim 3
Dependent Claim
20 words
The rubbery composition as defined in claim 1 wherein the trans 1,4-polybutadiene has a trans content from 80 to 95%.
Claim 4
Dependent Claim
23 words
The rubbery composition as defined in claim 1 wherein the trans 1,4-polybutadiene has a trans content varying from about 88% to about 92%.
Claim 5
Dependent Claim
32 words
The rubbery composition as defined in claim 1 wherein the first melting point ranges between 45° C. to 50° C. and the second melting point ranges between 70° C. to 107° C.
Claim 6
Dependent Claim
17 words
A rubber tire having a rubber component comprised of the rubbery composition as defined in claim 1.
References Cited (Backward Citations)
US4997896A
Cited
US5174838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |