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US5096973A
Expired / Lapsed
US
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Abc block copolymers based on butadiene, isoprene and styrene, process for their production and their use
Assignee: Sasol Germany GmbH
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Filing: 1990-10-01
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Granted: 1992-03-17
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Expires: 2010-10-01
Abstract
Abstract An unsaturated, elastomeric ABC block copolymer comprised of the monomer units of 40 to 80% of 1,3-butadiene, 5 to 40% of isoprene and 2 to 30% of styrene, said copolymer comprising i) 40 to 75% of block A which contains styrene and butadiene units or isoprene and butadiene units with a content of distributed vinyl or isopropenyl groups of less than 15%, iia) up to 25% of a block B which contains styrene and butadiene units or isoprene and butadiene units with a vinyl or isopropenyl content of more than 70%, or iib) up to 25% of a block B' which contains styrene, isoprene and optionally butadiene units with a content of homogeneously distributed isopropenyl or vinyl groups of less than 15%, and iii) 20 to 55% of a block C which contains styrene and isoprene units and optionally butadiene units with an isopropenyl or vinyl content of more than 70%.
Inventors
- 👤 Christoph Herrmann
- 👤 Walter Hellermann
- 👤 Hans-Bernd Fuchs
- 👤 Karl-Heinz Nordsiek
- 👤 Juergen Wolpers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:29
CPC Classifications
C; C08; C08F; C08F293/00; C08F297/00; C08F297/02; C08F297/04; C08F297/046; B; B60; B60C; B60C1/00; B60C1/0016; Y; Y10; Y10S; Y10S525/00; Y10S525/931
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A method of producing tire treads, comprising: forming the running surfaces of the tire treads from an ABC block copolymer comprised of 40-80% of 1,3-butadiene, 5-40% of isoprene and 2-30% of styrene, said copolymer comprising: (i) 40-75% of block A which contains isoprene and butadiene units with a content of distributed vinyl or isopropenyl groups of less than 15%; (iia) up to 25% of a block B which contains styrene and butadiene units or isoprene and butadiene units with a vinyl or isopropenyl content of more than 70%, or (iib) up to 25% of block B' which contains styrene, isoprene and optionally butadiene units with a content of homogeneously distributed isopropenyl or vinyl groups of less than 15%; and (iii) 20-55% of a block C which contains stryene and isoprene units and optionally butadiene units with an isopropenyl or vinyl content of more than 70%.
Claim 2
Independent Claim
145 words
A method of producing tire treads, comprising: forming the running surfaces of the tire treads from an ABC block copolymer comprised of 40-80% of 1,3-butadiene, 5-40% of isoprene and 2-30% of styrene, said copolymer comprising: (i) 40-75% of block A which contains isoprene and butadiene units with a content of distributed vinyl or isopropenyl groups of less than 15%; (iia) up to 25% of a block B which contains styrene and butadiene units or isoprene and butadiene units with a vinyl or isopropenyl content of more than 70%, or (iib) up to 25% of block B' which contains styrene, isoprene and optionally butadiene units with a content of homogeneously distributed isopropenyl or vinyl groups of less than 15%; and (iii) 20-55% of a block C which contains stryene and isoprene units and optionally butadiene units with an isopropenyl or vinyl content of more than 70%.
Claim 3
Dependent Claim
18 words
The method of claim 1, wherein the proportion of butadiene units in block A is 70 to 95%.
Claim 4
Dependent Claim
18 words
The method of claim 1, wherein the proportion of butadiene units in block B is 50 to 90%.
Claim 5
Dependent Claim
25 words
The method of claim 1, 2 or 3, wherein block C contains 0 to 30% butadiene, 20 to 70% isoprene and 10 to 60% styrene.
Claim 6
Dependent Claim
57 words
The method of claim 1, wherein the running surfaces of the tire treads are formed from a rubber component which is a combination of 70 to 100% by weight of said block copolymer with from 0 to 30% by weight of an amorphous rubber selected from the group consisting of stryene-butadiene rubber, 1,4-cis-polybutadiene, 1,4-cis-polyisoprene and natural rubber.
References Cited (Backward Citations)
EP0054440A1
Cited
US4814386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-17 | 1995-09-16 | 1996-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-17 | 1999-09-16 | 2000-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-17 | 2003-09-16 | 2004-03-17 | $7700.00 | Window Closed / Lapsed |