US4650825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of inorganic fiber products
Assignee: Hexion Specialty Chemicals AG
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Filing: 1985-05-06
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Granted: 1987-03-17
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Expires: 2005-05-06
Abstract
Abstract An improved process for the production of glass and mineral fiber products bonded with a phenolic resin in which an aqueous phenol-formaldehyde resin is applied to the inorganic fiber as the bonding agent which is formed with calcium hydroxide as condensation catalyst and the mixture is thermally cured, the improvement comprising prior to processing the aqueous phenol-formaldehyde resin is adjusted to a pH of 7.5 to 11 by addition of a base and sulfate ions are added in an amount of 80 to 200% of the stoichiometric amount required for bonding the calcium ions whereby the calcium ions are converted into a water-soluble complex stable for at least three hours without any precipitation and the products produced thereby.
Inventors
- 👤 Karl Jellinek
- 👤 Rolf Muller
- 👤 Gerhard Wisomirski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:16
CPC Classifications
C; C08; C08G; C08G14/00; C08G14/02; C08G14/04; C08G14/06; C08G14/08; C04; C04B; C04B26/00; C04B26/02; C04B26/10; C04B26/12; C04B26/122; C08G8/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
In a process for the production of glass and mineral fiber products bonded with a phenolic resin in which an aqueous phenol-formaldehyde resin is applied to the inorganic fiber as the bonding agent which is formed with calcium hydroxide as condensation catalyst and the mixture is thermally cured, the improvement comprising prior to processing the aqueous phenol-formaldehyde resin is adjusted to a pH of 7.5 to 11 by addition of a base and sulfate ions are added in an amount of 80 to 200% of the stoichiometric amount required for bonding the calcium ions whereby the calcium ions are converted into a water-soluble complex stable for at least three hours without any precipitation.
Claim 2
Dependent Claim
113 words
In a process for the production of glass and mineral fiber products bonded with a phenolic resin in which an aqueous phenol-formaldehyde resin is applied to the inorganic fiber as the bonding agent which is formed with calcium hydroxide as condensation catalyst and the mixture is thermally cured, the improvement comprising prior to processing the aqueous phenol-formaldehyde resin is adjusted to a pH of 7.5 to 11 by addition of a base and sulfate ions are added in an amount of 80 to 200% of the stoichiometric amount required for bonding the calcium ions whereby the calcium ions are converted into a water-soluble complex stable for at least three hours without any precipitation.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the molar ratio of phenol to formaldehyde of the aqueous phenol-formaldehyde resin is 1:1.3 to 1:4.0.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein 0.5 to 10.0% of calcium hydroxide, relative to the phenol share, are used as condensation catalyst for the water-soluble phenol-formaldehyde resin.
Claim 5
Dependent Claim
42 words
The process of claim 1 wherein the aqueous phenolformaldehyde resin condensed with calcium hydroxide is modified by the addition of urea in a quantity of up to 100 parts by weight of urea per 100 parts by weight of the phenol employed.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein a base is added to the bonding agent mixture to adjust the pH-range to 8.5 to 10.5.
Claim 7
Dependent Claim
10 words
The process of claim 5 wherein ammonia is the base.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein the sulfate ions are introduced into the bonding agent mixture in the form of ammonium sulfate.
Claim 9
Dependent Claim
34 words
The process of claim 1 wherein the sulfate ions are added in a quantity of 80 to 120% of the amount stoichiometrically required for bonding the calcium ions present in the bonding agent mixture.
Claim 10
Dependent Claim
56 words
The process of claim 1 wherein the stable bonding agent mixture is applied directly or after appropriate further dilution with water onto the fibers by high-pressure pumps through spray nozzles in the bubble or collecting chambers of continuously operating glass and mineral fiber production units, prior to the fibers being collected and compressed into fiber fleece.
Claim 11
Dependent Claim
28 words
The process of claim 1 wherein the bonding agent is applied to the glass and mineral fibers in a quantity of 1 to 10% calculated as dry substance.
Claim 12
Dependent Claim
28 words
The process of claim 1 wherein the bonding agent is applied to the glass and mineral fibers in a quantity of 3 to 8% calculated as dry substance.
References Cited (Backward Citations)
US2748101A
Cited
US3432453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |