US3661602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silane-stabilized silicate foams
Assignee: DU PONT AND POWER SILICATES Inc A CORP OF
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Filing: 1970-07-13
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Granted: 1972-05-09
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Expires: 1990-07-13
Abstract
Abstract Stable aqueous foams prepared from aqueous solutions of alkaline ionic silicates containing a cationic surface-active onium compound and an alkyl silane, and optionally containing colloidal amorphous silica and a latent acid or salt gelling agent. Rigid foams are obtained by setting the aqueous foams with a salt or acid, then drying the set foam. Inclusion of the silanes increases foamability of the solution, stability of the wet foam, and water resistance and strength of the dried foam.
Inventors
- 👤 Stephen A Gerow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:57
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/40; C04B24/42; C04B28/00; C04B28/24; C04B28/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
An improved foam of claim 1 in which the silane is sodium methyl siliconate, dimethyl diethoxy silane, gamma-aminopropyl triethoxy silane, or methyl trichlorosilane.
Claim 2
Dependent Claim
14 words
An improved foam of claim 1 in which the silane is sodium methyl siliconate.
Claim 3
Dependent Claim
113 words
In a process for making a stable, fluid or plastic aqueous foam by adding a cationic nitrogen-containing surface-active onium compound to an aqueous solution of an alkaline ionic silicate, then foaming the mixture, the improvement which comprises including in the mixture a stabilizing amount of a silane of the formula Si(R)a(OR'')b(Cl)c(ONa)d where a 1 or 2 b 0, 1, 2 or 3 c 0, 1, 2 or 3 d 0 or 1 a + b + c + d 4 b + c 2 or 3 R alkyl of one to four carbon atoms or aminoalkyl of one to four carbon atoms, and R'' hydrogen or alkyl of one to four carbon atoms.
Claim 4
Dependent Claim
24 words
An improved process as defined in claim 4 wherein the silane is sodium methyl siliconate, dimethyl diethoxy silane, gamma-aminopropyl triethoxy silane, or methyl trichlorosilane.
Claim 5
Dependent Claim
15 words
An improved process as defined in claim 5 wherein the silane is sodium methyL siliconate.
Claim 6
Dependent Claim
105 words
In a stable, rigid foam composed essentially of water, a gelled alkaline ionic silicate, and a cationic nitrogen-containing surface-active onium compound, the improvement which comprises inclusion in the foam prior to gellation of a stabilizing quantity of a silane of the formula Si(R)a(OR'')b(Cl)c(ONa)d where a 1 or 2 b 0, 1, 2 or 3 c 0, 1, 2 or 3 d 0 or 1 a + b + c + d 4 b + c 2 or 3 R alkyl of one to four carbon atoms or aminoalkyl of one to four carbon atoms, and R'' hydrogen or alkyl of one to four carbon atoms.
Claim 7
Dependent Claim
23 words
An improved foam of claim 7 in which the silane is sodium methyl siliconate, dimethyl diethoxy silane, gamma-aminopropyl triethoxy silane, or methyl trichlorosilane.
Claim 8
Dependent Claim
14 words
An improved foam of claim 7 in which the silane is sodium methyl siliconate.
Claim 9
Dependent Claim
125 words
In a process for making a stable, rigid foam by adding a cationic nitrogen-containing surface-active onium compound to an aqueous solution of an alkaline ionic silicates, then foaming the mixture, the improvement which comprises including in the mixture a stabilizing amount of a silane of the formula Si(R)a(OR'')b(Cl)c(ONa)d where a 1 or 2 b 0, 1, 2 or 3 c 0, 1, 2 or 3 d 0 or 1 a + b + c + d 4 b + c 2 or 3 R alkyl of one to four carbon atoms or aminoalkyl of one to four carbon atoms, and R'' hydrogen or alkyl of one to four carbon atoms, then setting the foam with an acid or salt gelling agent, then drying the foam.
Claim 10
Dependent Claim
23 words
A improved process as defined in claim 10 in which an inert solid filler is mixed with the aqueous foam prior to setting.
Claim 11
Dependent Claim
18 words
An improved process as defined in claim 10 in which the aqueous foam is set with acidic gas.
Claim 12
Dependent Claim
15 words
An improved process as defined in claim 10 in which the gas is carbon dioxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |