Patent US4759665A successfully refreshed from Google Patents.
US4759665A
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Consolidating and/or sealing soils and composition therefor
Assignee: Dynamit Nobel AG
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Filing: 1986-12-19
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Granted: 1988-07-26
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Expires: 2006-12-19
Abstract
Abstract A soil injection agent on an alkali metal silicate basis, containing as gelling agent trialkoxysilanes of the formula R-Si(OR') 3 , in which R is an aliphatic moiety of 1 to 6 carbon atoms and R' represents equal or different alkyl moieties of 1 to 4 carbon atoms, is adjusted for properties by the addition of acid alkali metal phosphates or ammonium phosphates and/or phosphoric acid. The addition improves the sealing and strengthening action of the gels and permits a reduction of the silane content, without impairing the resistance of the gels to pollutants.
Inventors
- 👤 Rudolf Burkhardt
- 👤 Hansjurgen Hass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:03
CPC Classifications
C; C09; C09K; C09K17/00; C09K17/40; C09K17/42; C09K17/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A composition for consolidating and sealing soils consisting essentially of a gel-forming mixture of alkali metal silicate having a density of from 1.20 to 1.4 gm/cm 3 , and a molar ratio of SiO 2 :Na 2 O of 3.5:1 to 4:1; water; one or more trialkoxysilanes of the formula R-Si(OR') 3 , in which R is an aliphatic moiety of 1 to 6 carbon atoms and R' represents equal or different alkyl moieties of 1 to 4 carbon atoms, as gelling agent; and as an additional substance for the adjustment of the setting time and/or gel strength, an acid alkali metal phosphate or ammonium phosphate and/or phosphoric acid.
Claim 2
Dependent Claim
109 words
A composition for consolidating and sealing soils consisting essentially of a gel-forming mixture of alkali metal silicate having a density of from 1.20 to 1.4 gm/cm 3 , and a molar ratio of SiO 2 :Na 2 O of 3.5:1 to 4:1; water; one or more trialkoxysilanes of the formula R-Si(OR') 3 , in which R is an aliphatic moiety of 1 to 6 carbon atoms and R' represents equal or different alkyl moieties of 1 to 4 carbon atoms, as gelling agent; and as an additional substance for the adjustment of the setting time and/or gel strength, an acid alkali metal phosphate or ammonium phosphate and/or phosphoric acid.
Claim 3
Dependent Claim
36 words
The composition of claim 1, wherein the additional substance is an acid alkali metal phosphate with a phosphoric acid excess, which corresponds to a molar ratio of H 3 PO 4 :NaOH or KOH=1.01:1 to 1.2:1.
Claim 4
Dependent Claim
24 words
The composition of claim 1, wherein the additional substance is in the form of a 2-15% aqueous solution and has a pH of 2-4.
Claim 5
Dependent Claim
21 words
The composition of claim 1, wherein the trialkoxysilane is selected from the group consisting of n-propyltrimethoxysilane, isobutyltrimethoxysilane, n-propyltriethoxysilane, isobutyltriethoxysilane and vinyltrimethoxysilane.
Claim 6
Dependent Claim
20 words
The composition of claim 1 wherein the gel-forming mixture has a density of from 1.22 to 1.28 gm/cm 3 .
Claim 7
Dependent Claim
19 words
A method for the solidification and/or sealing of soil comprising introducing the mixture of claim 1 into said soil.
Claim 8
Dependent Claim
20 words
A method for the immobilization of pollutants in a soil comprising introducing the mixture of claim 1 into said soil.
References Cited (Backward Citations)
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US2842444A
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US3704594A
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JPS5178008A
Cited
US4056937A
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US4074536A
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US4316807A
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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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |