US4296008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealant composition
Assignee: Shell USA Inc
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Filing: 1980-04-21
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Granted: 1981-10-20
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Expires: 2000-04-21
Abstract
Abstract A sealant composition possessing an excellent balance of properties including good tack, low melt viscosity and a cohesive failure mechanism in the 180° peel test comprises a selectively hydrogenated monoalkenyl arene/conjugated diene block copolymer component having certain block molecular weights, tackifying resin, plasticizers and silane coupling agent.
Inventors
- 👤 David J. St. Clair
- 👤 Earle E. Ewins, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:11
CPC Classifications
C; C09; C09J; C09J153/00; C09J153/02; C09J153/025; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A sealant composition possessing excellent oxidative and UV stability along with improved tack, reduced melt viscosity, and a cohesive failure mechanism in the 180° peel test comprises: (a) 100 parts by weight of a selectively hydrogenated block copolymer component comprising an A'B' block copolymer and a multiblock copolymer having at least two end blocks A and at least one mid block B wherein the A' and A blocks are monoalkenyl arene polymer blocks and the B' and B blocks are substantially completely hydrogenated conjugated diene polymer blocks, the number average molecular weight of the A' and A blocks are between about 3,000 and about 7,000, and the monoalkenyl arene content of the multiblock copolymer is between about 7% and about 22% by weight, wherein the weight ratio between the A' B' block copolymer and the multiblock copolymer is 20:80 to about 60:40; about 50 to about 350 parts by weight of a tackifying resin compatible with block B; (c) about 0 to about 100 parts by weight of a plasticizer; and (d) about 0.1 to about 10 parts by weight of a silane coupling agent.
Claim 2
Dependent Claim
185 words
A sealant composition possessing excellent oxidative and UV stability along with improved tack, reduced melt viscosity, and a cohesive failure mechanism in the 180° peel test comprises: (a) 100 parts by weight of a selectively hydrogenated block copolymer component comprising an A'B' block copolymer and a multiblock copolymer having at least two end blocks A and at least one mid block B wherein the A' and A blocks are monoalkenyl arene polymer blocks and the B' and B blocks are substantially completely hydrogenated conjugated diene polymer blocks, the number average molecular weight of the A' and A blocks are between about 3,000 and about 7,000, and the monoalkenyl arene content of the multiblock copolymer is between about 7% and about 22% by weight, wherein the weight ratio between the A' B' block copolymer and the multiblock copolymer is 20:80 to about 60:40; about 50 to about 350 parts by weight of a tackifying resin compatible with block B; (c) about 0 to about 100 parts by weight of a plasticizer; and (d) about 0.1 to about 10 parts by weight of a silane coupling agent.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 wherein said monoalkenyl arene is styrene and said conjugated diene is butadiene.
Claim 4
Dependent Claim
18 words
A composition according to claim 1 wherein said multiblock copolymer is a selectively hydrogenated linear polystyrene-polybutadiene-polystyrene block copolymer.
Claim 5
Dependent Claim
18 words
A composition according to claim 3 wherein said A'B' block copolymer is a selectively hydrogenated polystyrene-polybutadiene block copolymer.
Claim 6
Dependent Claim
18 words
A composition according to claim 3 wherein said A'B' block copolymer is a selectively hydrogenated polystyrene-polyisoprene block copolymer.
Claim 7
Dependent Claim
17 words
A composition according to claim 1 wherein said multiblock copolymer is a selectively hydrogenated polystyrene-polyisoprene-polystyrene block copolymer.
Claim 8
Dependent Claim
22 words
A composition according to claim 2 wherein said butadiene block has a 1,2 configuration of between about 35 and 65 mol percent.
Claim 9
Dependent Claim
27 words
A translucent composition according to claim 1 wherein the amount of silane coupling agent is between about 0.25 parts by weight and about 2.5 parts by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |