US4121958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation board
Assignee: United States Mineral Products Co
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Filing: 1977-09-21
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Granted: 1978-10-24
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Expires: 1997-09-21
Abstract
Abstract This invention pertains to a thermal insulating laminate which comprises a rigid, closed cell foam core, suitably a polyurethane foam core, and a porous fabric or paper sheet adhered to at least one surface of the core. The porous sheet layer is impregnated with polymeric material having the same composition as the core during the lamination process. This invention also pertains to the modification in which a metallic foil is bonded to the porous sheet by means of a flame-resistant and low smoke-producing adhesive. Preferably, there is also a network of glass fiber strands between the sheet and the foil. The laminate can be used as insulating board under built-up roofs, for wall sheathing in building construction, and all other normal applications for rigid polyurethane insulation. The laminate incorporating the foil-glass layers can also be utilized in situations where additional dimensional stability and additional flame resistance are required.
Inventors
- 👤 Lamonte R. Koonts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:36
CPC Classifications
F; F16; F16L; F16L59/00; B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; E; E04; E04D; E04D3/00; E04D3/35; E04D3/351; F16L59/08; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249954; Y10T428/249962; Y10T428/249964; Y10T428/249965
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
164 words
A process for making a thermal insulating laminate capable of passing the Humid Aging Test, which laminate has (i) a rigid closed-cell foam core, the cells of said core containing a fluorocarbon gas, and (ii) a porous sheet of paper adhered to a first face of said core, comprising the steps in order: (a) applying liquid polyurethane or polyisocyanurate-based polymer chemicals at a temperature of about 23° C. to the porous sheet at a temperature of from 25° to 35° C. in a process area at a temperature of from 20° to 24° C., said liquid chemicals having sufficiently long cream time and low enough viscosity to impregnate said porous sheet prior to foaming; (b) allowing the liquid chemicals to foam to produce the rigid core, said core being allowed to rise to at least approximately 90% of full rise before applying any external heat to it; and (c) curing the laminate at a temperature in the range of from 120° to 150° F.
Claim 2
Dependent Claim
164 words
A process for making a thermal insulating laminate capable of passing the Humid Aging Test, which laminate has (i) a rigid closed-cell foam core, the cells of said core containing a fluorocarbon gas, and (ii) a porous sheet of paper adhered to a first face of said core, comprising the steps in order: (a) applying liquid polyurethane or polyisocyanurate-based polymer chemicals at a temperature of about 23° C. to the porous sheet at a temperature of from 25° to 35° C. in a process area at a temperature of from 20° to 24° C., said liquid chemicals having sufficiently long cream time and low enough viscosity to impregnate said porous sheet prior to foaming; (b) allowing the liquid chemicals to foam to produce the rigid core, said core being allowed to rise to at least approximately 90% of full rise before applying any external heat to it; and (c) curing the laminate at a temperature in the range of from 120° to 150° F.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the cream time is 7 to 10 seconds.
Claim 4
Dependent Claim
26 words
The process of claim 1 in which the porous sheet is 25 to 50 pound porous laminating kraft paper and the fluorocarbon gas is Freon 11.
Claim 5
Dependent Claim
38 words
The process of claim 1 wherein a second porous sheet of paper is adhered to a second face of the core opposite the first face and the liquid chemicals are applied to and between the porous sheets simultaneously.
Claim 6
Dependent Claim
34 words
The process of claim 1 wherein a metallic foil coextensive with the porous sheet is bonded thereto by a flame-resistant and low-smoke producing adhesive, said foil constituting the outer layer of the insulating laminate.
Claim 7
Dependent Claim
11 words
The process of claim 1 further comprising perforating the porous sheet.
Claim 8
Dependent Claim
14 words
The process of claim 1 further comprising perforating the porous sheet and metallic foil.
Claim 9
Dependent Claim
17 words
The process of claim 1 wherein a network of glass fiber strands is embedded in the adhesive.
Claim 10
Dependent Claim
19 words
The process of claim 1 further comprising grooving an outer surface of the laminate to provide moisture transmission channels.
Claim 11
Dependent Claim
19 words
The process of claim 5 further comprising grooving an outer surface of the laminate to provide moisture transmission channels.
References Cited (Backward Citations)
US2728702A
Cited
US3061475A
Cited
US3647609A
Cited
US3980511A
Cited
US3755031A
Cited
US3844878A
Cited
US3874980A
Cited
US3903346A
Cited
US3953269A
Cited
US3951717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |