US4937104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for imparting hydrophobicity to mineral substrates
Assignee: Huels AG
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Filing: 1984-12-21
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Granted: 1990-06-26
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Expires: 2004-12-21
Abstract
Abstract Disclosed is a process for imparting hydrophobicity to an inorganic porous mineral substrate which comprises mixing at least one silane and/or hydrolysis and/or condensation product thereof, at least deactivatable surfactant and water or a water/organic alcohol mixture to form a dispersion emulsion, applying the resulting dispersion or emulsion to the substrate, and, if necessary, subsequently treating the substrate in order to deactivate the surfactant.
Inventors
- 👤 Josef A. Puhringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:34
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/60; C04B41/61; C04B41/62; C04B41/64; C04B41/45; C04B41/46; C04B41/49; C04B41/4905; C04B41/4922; C04B41/495; C04B41/4961
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A process for imparting hydrophobicity to an inorganic porous alkaline mineral substrate comprising the steps of applying a composition comprising a dispersion or emulsion formed of alkyltrialkoxy silane or a condensation product thereof, 0.01 to 1.0% by volume of a surfactant which is decomposed by the alkalinity of the mineral substrate, and a medium wherein these components are dispersed or emulsified, selected from the group consisting of water and a water-alcohol mixture, said medium forming 75% to 90% by volume of the emulsion or dispersion, to the mineral substrate; and thereafter allowing the surfactant to become deactivated by the alkalinity of the substrate.
Claim 2
Dependent Claim
103 words
A process for imparting hydrophobicity to an inorganic porous alkaline mineral substrate comprising the steps of applying a composition comprising a dispersion or emulsion formed of alkyltrialkoxy silane or a condensation product thereof, 0.01 to 1.0% by volume of a surfactant which is decomposed by the alkalinity of the mineral substrate, and a medium wherein these components are dispersed or emulsified, selected from the group consisting of water and a water-alcohol mixture, said medium forming 75% to 90% by volume of the emulsion or dispersion, to the mineral substrate; and thereafter allowing the surfactant to become deactivated by the alkalinity of the substrate.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the surfactant comprises an alcohol-alkylene oxide adduct.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein the surfactant comprises an ester.
References Cited (Backward Citations)
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |