US4251590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature pipe insulation
Assignee: Johns Manville Corp
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Filing: 1979-06-18
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Granted: 1981-02-17
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Expires: 1999-06-18
Abstract
Abstract This invention relates to pipe insulation useful at relatively high temperatures, e.g., 850° F. Mineral fibers bonded with phenol-formaldehyde resins and conventional anti-punking liquid resin systems have been developed as a means of producing thermal insulation of relatively low density. However, sustained punking of the binders employed caused exothermic reactions whose temperatures fused the low density mineral fibers causing thermal and structural degradation of the insulation. The present invention utilizes a relatively dense layer of fiber glass having a relatively low binder content, bonded with a binder comprising an antipunk phenolic resin and high levels of silane based on the solids content in the resin. An outer layer may surround the dense layer and be constructed with a lower density and a higher binder content.
Inventors
- 👤 Kent A. Rubright
- 👤 William C. Magill
- 👤 Spencer I. Meier
- 👤 Romain E. Loeffler, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:12
CPC Classifications
B; B29; B29C; B29C70/00; C; C04; C04B; C04B26/00; C04B26/02; C04B26/10; C04B26/12; C04B26/122; F; F16; F16L; F16L59/00; F16L59/02; F16L59/028; B29K; B29K2309/00; B29K2309/08; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31652; Y10T428/31663; Y10T442/00; Y10T442/20; Y10T442/2926; Y10T442/2992
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A high temperature pipe insulation comprising a layer of glass fibers having an average density which lies between about 5-7 pounds per cubic foot, said glass fibers being bonded with a binder in an amount which lies between about 2-8% LOI, said binder comprising an antipunking phenolic resin and silane, and wherein the silane content in said binder comprises an amount from about 0.5-5% of the solids content in said phenolic resin.
Claim 2
Dependent Claim
72 words
A high temperature pipe insulation comprising a layer of glass fibers having an average density which lies between about 5-7 pounds per cubic foot, said glass fibers being bonded with a binder in an amount which lies between about 2-8% LOI, said binder comprising an antipunking phenolic resin and silane, and wherein the silane content in said binder comprises an amount from about 0.5-5% of the solids content in said phenolic resin.
Claim 3
Dependent Claim
20 words
The pipe insulation as defined in claim 1, wherein the density of said layer averages 6 pounds per cubic foot.
Claim 4
Dependent Claim
27 words
The pipe insulation of claim 1, wherein said binder further comprises an agent to keep the binder soluble and an agent to make said layer water resistant.
Claim 5
Dependent Claim
22 words
The pipe insulation of claim 3, wherein said solubility agent is aqua ammonia and said water resistant agent is a silicon emulsion.
Claim 6
Dependent Claim
44 words
The pipe insulation as defined in claim 1, wherein said layer is covered by at least one additional layer of glass fibers, said additional layer of glass fibers, said additional layer having a lower average density and a higher binder content than said layer.
Claim 7
Dependent Claim
20 words
The pipe insulation of claim 5, wherein said additional layer of glass fibers are bonded using a phenolic resin binder.
Claim 8
Dependent Claim
22 words
The pipe insulation of claim 5 or claim 6, wherein the binder content within said additional layer lies between about 6-15% LOI.
Claim 9
Dependent Claim
22 words
The pipe insulation of claim 7, wherein the average density of said additional layer lies between about 3-6 pounds per cubic foot.
Claim 10
Dependent Claim
31 words
The pipe insulation of claim 1 or claim 5, wherein the diameter of the glass fibers in said layer and said additional layer lies within the range of about 4-7 microns.
Claim 11
Dependent Claim
20 words
The pipe insulation of claim 1 or claim 2 or claim 5, wherein the binder content is about 4.5% LOI.
Claim 12
Dependent Claim
24 words
The pipe insulation of claim 10, wherein the silane content in said binder is between about 1-2% of the solids content in said resin.
References Cited (Backward Citations)
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US2790464A
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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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |