US4134928A
Expired / Lapsed
US
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Tetrablock polydienes
Assignee: Phillips Petroleum Co
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Filing: 1977-06-24
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Granted: 1979-01-16
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Expires: 1997-06-24
Abstract
Abstract Hydrogenated tetrablock polydienes such as polybutadiene-polyisoprene-polybutadiene-polyisoprene exhibit improved elongation as compared to both of the very similar hydrogenated triblock polydienes polybutadiene-polyisoprene-polybutadiene and polyisoprene-polybutadiene-polyisoprene.
Inventors
- 👤 George A. Moczygemba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:07
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A tetrablock copolymer having the formula B.sub.h -- I.sub.h ' -- B.sub.h ' -- I.sub.h wherein B h and B h ' are hydrogenated blocks of polymerized butadiene, I h and I h ' are hydrogenated blocks of polymerized alkyl substituted conjugated diene of 5 or 6 carbon atoms per molecule.
Claim 2
Dependent Claim
51 words
A tetrablock copolymer having the formula B.sub.h -- I.sub.h ' -- B.sub.h ' -- I.sub.h wherein B h and B h ' are hydrogenated blocks of polymerized butadiene, I h and I h ' are hydrogenated blocks of polymerized alkyl substituted conjugated diene of 5 or 6 carbon atoms per molecule.
Claim 3
Dependent Claim
27 words
A polymer in accordance with claim 1 wherein less than about 10 percent of the original unsaturation of the polymerized diene blocks is present in the polymer.
Claim 4
Dependent Claim
63 words
A polymer in accordance with claim 1 wherein each of the hydrogenated blocks of polymerized butadiene B h and B h ' constitute 10 to 40 weight percent of the total polymer, the block I h constitutes 5 to 30 weight percent of the total polymer and the block I h ' constitutes from 20 to 60 weight percent of the total polymer.
Claim 5
Dependent Claim
29 words
A polymer in accordance with claim 1 wherein the total of the blocks B h and B h ' constitute 20 to 50 weight percent of the total polymer.
Claim 6
Dependent Claim
19 words
A polymer in accordance with claim 1 wherein I and I h ' are hydrogenated blocks of polymerized isoprene.
Claim 7
Dependent Claim
18 words
A polymer in accordance with claim 1 having a weight average molecular weight of about 50,000 to 750,000.
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |