Patent US4057519A successfully refreshed from Google Patents.
US4057519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium silicate extended polyurethane foam
Assignee: Cook Composites and Polymers Co
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Filing: 1975-12-15
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Granted: 1977-11-08
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Expires: 1995-12-15
Abstract
Abstract Polyurethane foam products having relatively noncombustible properties, low flame spread ratings and low smoke generating tendencies when exposed to fire can be produced by combining aqueous sodium silicate into the foam forming composition which also includes a viscous, hydroxyl-terminated polyester and a polyisocyanate prepolymer or quasi-prepolymer along with a suitable catalyst, surfactant and halogenated alkane blowing agent. The aqueous sodium silicate ingredient constitutes from about 30 to 60 percent by weight. The aqueous sodium silicate has a weight ratio of SiO 2 /Na 2 O of 2.4 to 3.0 and contains 25 to 75 percent by weight water. The resulting foam, with a density of 1.5 to 4.5 pounds per cubic foot, has a K-factor less than 0.26 and is useful as a thermal insulating substance, especially in building panels.
Inventors
- 👤 John E. Summers
- 👤 John F. Hadley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:22
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/088; C08G18/0885; C08G18/28; C08G18/30; C08G18/38; C08G18/3893; C08G18/3895; C08G18/40; C08G18/4009; C08G18/4027; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A process for producing a rigid foam structure having a density of 1.5 to 4.5 pounds per cubic foot and a K-factor less than 0.26 which comprises reacting together as a foam forming formulation A. a hydroxyl-terminated polyester having a viscosity greater than 100,000 cps at 25° C; B. an organic polyisocyanate prepolymer or quasi-prepolymer prepared by reacting at least one polyol with an excess of organic polyisocyanate; C. aqueous sodium silicate having a weight ratio of SiO 2 /Na 2 O of 2.4 to 3.0 and an aqueous content of 25 to 75 percent by weight; wherein at least one of the three components (A, B, C) contains a dissolved halogenated alkane blowing agent; in the presence of a surfactant and a catalyst for the reaction of --OH and --N═C═O radicals; and wherein the weight of said aqueous alkali metal silicate constitutes from 30 to 60 percent of the components.
Claim 2
Dependent Claim
151 words
A process for producing a rigid foam structure having a density of 1.5 to 4.5 pounds per cubic foot and a K-factor less than 0.26 which comprises reacting together as a foam forming formulation A. a hydroxyl-terminated polyester having a viscosity greater than 100,000 cps at 25° C; B. an organic polyisocyanate prepolymer or quasi-prepolymer prepared by reacting at least one polyol with an excess of organic polyisocyanate; C. aqueous sodium silicate having a weight ratio of SiO 2 /Na 2 O of 2.4 to 3.0 and an aqueous content of 25 to 75 percent by weight; wherein at least one of the three components (A, B, C) contains a dissolved halogenated alkane blowing agent; in the presence of a surfactant and a catalyst for the reaction of --OH and --N═C═O radicals; and wherein the weight of said aqueous alkali metal silicate constitutes from 30 to 60 percent of the components.
Claim 3
Dependent Claim
16 words
A homogeneous polyurethane foam, essentially free of uncombined water, formed by the process of claim 1.
Claim 4
Dependent Claim
45 words
The process of claim 1 wherein the said foam forming formulation includes 0.5 to 5.0 percent by weight of an organic condensable resin selected from the class consisting of melamine-formaldehyde, urea-formaldehyde and methylolated melamine-formaldehyde; and also includes a catalyst for the condensation of melamine resins.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the said foam forming formulation includes 0.5 to 2.0 percent by weight of a phenolic resin.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the said foam forming formulation includes 0.1 to 5.0 percent by weight of formaldehyde.
References Cited (Backward Citations)
FR1419552A
Cited
GB1137465A
Cited
US3634342A
Cited
US3983081A
Cited
US3981831A
Cited
US3975313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |