Patent US4032489A successfully refreshed from Google Patents.
US4032489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butyl glazing composition
Assignee: USM Corp
•
Filing: 1975-06-24
•
Granted: 1977-06-28
•
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 11:50
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.
References Cited (Backward Citations)
US3231419A
Cited
US3239478A
Cited
US3352944A
Cited
US3424836A
Cited
US3686364A
Cited
US3625752A
Cited
US3660323A
Cited
US3759771A
Cited
US3932328A
Cited
US3852149A
Cited
US3870676A
Cited
US3850858A
Cited
US3935893A
Cited
US3984369A
Cited
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 |