US5147939A
Expired / Lapsed
US
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Unsaturated, elastomeric, asymmetrically coupled block copolymer, a single batch process for its manufacture and its use for the production of tire components
Assignee: Sasol Germany GmbH
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Filing: 1989-10-04
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Granted: 1992-09-15
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Expires: 2009-10-04
Abstract
Abstract An unsaturated, elastomeric, asymmetrically coupled block copolymer of the formula: (A--B).sub.n --X--(B).sub.m, wherein block A is a block of polybutadiene having an 8 to 60% content of uniformly distributed vinyl groups and block B is a homopolymer of isoprene or a copolymer of at leat 10% isoprene units with 0 to 60% butadiene units and up to 45% styrene units and X is a radical of a coupling agent, and (m-n)≧0 while (m+n) ranges from 3 to 25.
Inventors
- 👤 Walter Hellermann
- 👤 Christoph Herrmann
- 👤 Karl-Heinz Nordsiek
- 👤 Jurgen Wolpers
- 👤 Hans-Bernd Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:32
CPC Classifications
C; C08; C08F; C08F293/00; C08F297/00; C08F297/02; C08F297/04; C08F297/046; Y; Y10; Y10S; Y10S152/00; Y10S152/905
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
An unsaturated, elastomeric, asymmetrically coupled block copolymer of the formula (I): (A--B).sub.n --X--(B).sub.m, (I) wherein block A is a block of polybutadiene having an 8 to 60% content of uniformly distributed vinyl groups and block B is a homopolymer of isoprene or a copolymer of at least 10% isoprene units with 0 to 60% butadiene units and up to 45% styrene units, X is a radical of a polyfunctional coupling agent having a functionality of at least 3, and (m-n)≧0 while (m+n) ranges from 3 to 25 and n is a positive number.
Claim 2
Dependent Claim
93 words
An unsaturated, elastomeric, asymmetrically coupled block copolymer of the formula (I): (A--B).sub.n --X--(B).sub.m, (I) wherein block A is a block of polybutadiene having an 8 to 60% content of uniformly distributed vinyl groups and block B is a homopolymer of isoprene or a copolymer of at least 10% isoprene units with 0 to 60% butadiene units and up to 45% styrene units, X is a radical of a polyfunctional coupling agent having a functionality of at least 3, and (m-n)≧0 while (m+n) ranges from 3 to 25 and n is a positive number.
Claim 3
Dependent Claim
31 words
The block copolymer according to claim 1, wherein said block copolymer of formula (I) is comprised of 40-90% of butadiene, up to 40% of isoprene, and 0 to 30% of styrene.
Claim 4
Dependent Claim
30 words
The block copolymer according to claim 1 or 2, wherein block A represents 40 to 80% of all blocks and the blocks B represents 60 to 20% of all blocks.
Claim 5
Dependent Claim
57 words
The block copolymer according to claim 1 wherein the block A represents 40 to 80% of all blocks, the blocks B represent 60 to 20%s of all blocks, each of the blocks B is a copolymer of butadiene and isoprene with 0 to 45% styrene having a vinyl and 3,4 isopropenyl group content of 75 to 90%.
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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |