US4032489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butyl glazing composition
Assignee: USM Corp
•
Filing: 1975-06-24
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Granted: 1977-06-28
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Expires: 1995-06-24
Abstract
Abstract A composition based on butyl rubber resins and filler particularly useful for hot melt application as a sealant for combining a plurality of glass panes in an insulating glazing unit in which improved workability in heated condition is secured without adversely affecting its other properties through inclusion of a minor amount of a thermoplastic block copolymer of polystyrene and polybutadiene or polystyrene and polyisoprene.
Inventors
- 👤 Hilmar Haverstreng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:52
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08K; C08K3/00; C08K3/01; C08K3/013; C08L53/00; C08L53/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
A hot melt sealant consisting essentially of at least 30% by weight of butyl-rubber, from 25% to 45% by weight of tackifying resin, from 20% to 40% by weight of finely divided filler and sufficient of a styrene/butadiene/styrene block copolymer or of styrene/isoprene/styrene block copolymer to provide 0.5 to 10% by weight copolymer in the sealant.
Claim 2
Dependent Claim
56 words
A hot melt sealant consisting essentially of at least 30% by weight of butyl-rubber, from 25% to 45% by weight of tackifying resin, from 20% to 40% by weight of finely divided filler and sufficient of a styrene/butadiene/styrene block copolymer or of styrene/isoprene/styrene block copolymer to provide 0.5 to 10% by weight copolymer in the sealant.
Claim 3
Dependent Claim
41 words
A sealant according to claim 1 wherein the block copolymer consists of two polystyrene blocks A with an average molecular weight of 8,000 to 45,000, and a polybutadiene or polyisoprene block B with an average molecular weight of 35,000 to 150,000.
Claim 4
Dependent Claim
17 words
A sealant according to claim 2 containing 1.5 to 7.5% by weight of the thermoplastic block copolymer.
Claim 5
Dependent Claim
17 words
A sealant according to claim 3, containing 1.5 to 3% by weight of the thermoplastic block copolymer.
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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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |