US4413098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isoprene-butadiene copolymer rubber having improved processing properties
Assignee: Asahi Kasei Corp
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Filing: 1981-09-16
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Granted: 1983-11-01
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Expires: 2001-09-16
Abstract
Abstract An isoprene-butadiene copolymer rubber having improved processing properties which comprises a microstructure of the butadiene portion having from 70% to 90% of trans-1,4 linkage and from 2% to 8% of vinyl linkage, an isoprene content of from 3 to 25 wt %, and a styrene content of from 0 to 30 wt %, said copolymer rubber having a Mooney Viscosity of from 30 to 150, and a molecular weight distribution, Mw/Mn of from 1.2 to 3.5, said rubber, in the unelongated state, not showing a melting point measured by the differential calorimeter analysis method. The copolymer rubber of the present invention can be used for tires, for example, a tread and a carcass or for other rubber uses.
Inventors
- 👤 Yasuo Hattori
- 👤 Takeshi Ikematu
- 👤 Toshio Ibaragi
- 👤 Makoto Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:52
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
An isoprene-butadiene copolymer rubber having improved processing properties which comprises a microstructure of the butadiene portion having from 70% to 90% of trans-1,4 linkage and from 2% to 8% of vinyl linkage, an isoprene content of from 3 to 25 wt %, and a styrene content of from 0 to 30 wt %, said copolymer rubber having a Mooney Viscosity of from 30 to 150, and a molecular weight distribution, Mw/Mn of from 1.2 to 3.5, said rubber, in the unelongated state, not exhibiting a melting point measured by the differential scanning calorimeter analysis method.
Claim 2
Dependent Claim
95 words
An isoprene-butadiene copolymer rubber having improved processing properties which comprises a microstructure of the butadiene portion having from 70% to 90% of trans-1,4 linkage and from 2% to 8% of vinyl linkage, an isoprene content of from 3 to 25 wt %, and a styrene content of from 0 to 30 wt %, said copolymer rubber having a Mooney Viscosity of from 30 to 150, and a molecular weight distribution, Mw/Mn of from 1.2 to 3.5, said rubber, in the unelongated state, not exhibiting a melting point measured by the differential scanning calorimeter analysis method.
Claim 3
Dependent Claim
24 words
The isoprene-butadiene copolymer rubber as claimed in claim 1, wherein the total content of isoprene and styrene is not more than 25 wt %.
Claim 4
Dependent Claim
18 words
The isoprene-butadiene copolymer rubber as claimed in claim 1 or 2, wherein the isoprene is substantially randomly copolymerized.
Claim 5
Dependent Claim
18 words
The isoprene-butadiene copolymer rubber as claimed in claim 1 or 2, wherein the isoprene is substantially block copolymerized.
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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |