US4565577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pollutant-resistant sealing composition
Assignee: Dynamit Nobel AG
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Filing: 1984-07-24
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Granted: 1986-01-21
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Expires: 2004-07-24
Abstract
Abstract The present invention relates to compositions for making sealing walls, dump linings and the like, especially barriers placed in the ground. The compositions contain expandable clay minerals, cement and fillers in aqueous suspension, as well as additives of alkali metal aluminates and alkoxy alkylsilanes. On the basis of these additives, the sealing action against water and pollutants is substantially improved, so that sealing walls prepared therefrom, especially in combination with an also pollutant-resistant sealing floor, can be used for the encapsulation of pollutants in permeable soils.
Inventors
- 👤 Rudolf Burkhardt
- 👤 Hansjurgen Hass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:36
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C09; C09K; C09K17/00; C09K17/40; C09K17/42; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A pollutant-resistant composition for sealing walls and other soil barriers comprising expandable clay minerals present in an amount of 1 to 8 wt.-% of the composition, hydraulic binding agents settable by water without activators, fillers and water, a trialkoxysilane of the formula R--Si(OR') 3 in an amount of 0.5 to 5 wt.-% with respect to the solid content of the composition, in which R represents an aliphatic moiety having 2 to 6 carbon atoms and R' is hydrogen or identical or different alkyl moieties of 1 to 4 carbon atoms, or their hydrolysis products, and alkali aluminates in such amounts that their Al 2 O 3 content corresponds to 0.01 to 1.5 wt.% of the solid content of the composition.
Claim 2
Dependent Claim
120 words
A pollutant-resistant composition for sealing walls and other soil barriers comprising expandable clay minerals present in an amount of 1 to 8 wt.-% of the composition, hydraulic binding agents settable by water without activators, fillers and water, a trialkoxysilane of the formula R--Si(OR') 3 in an amount of 0.5 to 5 wt.-% with respect to the solid content of the composition, in which R represents an aliphatic moiety having 2 to 6 carbon atoms and R' is hydrogen or identical or different alkyl moieties of 1 to 4 carbon atoms, or their hydrolysis products, and alkali aluminates in such amounts that their Al 2 O 3 content corresponds to 0.01 to 1.5 wt.% of the solid content of the composition.
Claim 3
Dependent Claim
18 words
The composition of claim 1, wherein the trialkoxysilane is selected from the group consisting of propyltrimethoxysilane or isobutyltrimethoxysilane.
Claim 4
Dependent Claim
12 words
The composition of claim 1, wherein the alkali aluminate is sodium aluminate.
Claim 5
Dependent Claim
16 words
The composition of claim 1, wherein the expandable clay minerals are silicates with stratified lattice structures.
Claim 6
Dependent Claim
15 words
The composition of claim 4, wherein the hydraulic binding agents are hydraulic mortars or cements.
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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) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |