US4781950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for impregnating mineral building materials
Assignee: Evonik Operations GmbH
•
Filing: 1987-07-30
•
Granted: 1988-11-01
•
Expires: 2007-07-30
Abstract
Abstract Method for impregnating mineral building materials, with aqueous solutions of silanols and/or siloxanols is disclosed. The solution is obtained by continuous hydrolysis of alkoxysilanes and/or alkoxysiloxanes, of the general formula ##EQU1## wherein R 1 =alkyl with 1 to 8 carbon atoms, at least 90% of the R 1 groups in the average molecule being alkyl groups with 1 to 4 carbon atoms, R 2 =methyl or ethyl, a=0 to 1.5, b=1.0 to 4.0, a+b=2.0 to 4.0 in an amount corresponding to the expected consumption. The solution obtained is applied on the mineral building material within 3 to 30 minutes after the reactants are mixed. Suitable hydrolysis apparatus is also disclosed.
Inventors
- 👤 Herbert Giesing
- 👤 Gotz Koerner
- 👤 Eckehard Schamberg
- 👤 Jakob Wassermeyer
- 👤 Christian Weitemeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:23
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/46; C04B41/49; C04B41/4905; C04B41/495; C04B41/4961; C04B41/4966; B; B01; B01J; B01J19/00; B01J19/18; B01J2219/00; B01J2219/00049; B01J2219/00164; B01J2219/00182; B01J2219/18; B01J2219/185
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
A method of impregnating mineral building material, such as masonry, at a predetermined site with aqueous solution of silanol and/or siloxanol which comprises (a) continuously hydrolyzing at said site alkoxysilane and/or alkoxysiloxane compounds of the general formula ##EQU2## wherein R 1 is alkyl with 1 to 8 carbon atoms, at least 90% of the R 1 groups in the average molecule being alkyl with 1 to 4 carbon atoms, R 2 is methyl or ethyl, a=0 to 1.5, b=1.0 to 4.0 and a+b=2.0 to 4.0, by mixing water with said compounds, said hydrolysis being carried out with amounts of water and said compounds so as to obtain an amount of hydrolysate solution, which is used for impregnating purpose within a period not exceeding about 30 minutes, and (b) applying the solution of (a) to building material at said site within a time span of 3-30 minutes after the water and said compounds have been mixed.
Claim 2
Independent Claim
155 words
A method of impregnating mineral building material, such as masonry, at a predetermined site with aqueous solution of silanol and/or siloxanol which comprises (a) continuously hydrolyzing at said site alkoxysilane and/or alkoxysiloxane compounds of the general formula ##EQU2## wherein R 1 is alkyl with 1 to 8 carbon atoms, at least 90% of the R 1 groups in the average molecule being alkyl with 1 to 4 carbon atoms, R 2 is methyl or ethyl, a=0 to 1.5, b=1.0 to 4.0 and a+b=2.0 to 4.0, by mixing water with said compounds, said hydrolysis being carried out with amounts of water and said compounds so as to obtain an amount of hydrolysate solution, which is used for impregnating purpose within a period not exceeding about 30 minutes, and (b) applying the solution of (a) to building material at said site within a time span of 3-30 minutes after the water and said compounds have been mixed.
Claim 3
Dependent Claim
62 words
The method of claim 1, wherein the continuous hydrolysis is carried out in a plurality of communicating reaction zones, less than the total amount of water required for the hydrolysis being initially mixed with said compounds in the first of the reaction zones, the remainder of the required water being added to the hydrolysis product in another one of said reaction zones.
Claim 4
Dependent Claim
33 words
The method of claim 2, wherein the reaction zones are arranged one above the other, a portion of hydrolysis product obtained in a higher reaction zone being returned to a lower reaction zone.
Claim 5
Independent Claim
15 words
The method of claims 1 or 2, wherein said compounds have the general formula ##STR7##
Claim 6
Independent Claim
15 words
The method of claims 1 or 2, wherein said compounds have the general formula ##STR8##
Claim 7
Dependent Claim
18 words
The method of claim 5 wherein CH 3 Si(OC 2 H 5 ) 3 is used as ethoxysilane.
Claim 8
Independent Claim
34 words
The method as claimed in claims 1 or 2, wherein the solution of (a) is applied on the mineral building material within a period of 5 to 20 minutes after the reactants are mixed.
Claim 9
Independent Claim
26 words
The method of claims 1 or 2, wherein the hydrolysis is carried out in the pH range of 3-5 and in the presence of a catalyst.
Claim 10
Independent Claim
18 words
The method of claims 1 or 2, wherein a=0 to 1.0 b=3.0 to 4.0 and a+b=3.5 to 4.0.
Claim 11
Independent Claim
42 words
The method of claims 1 or 2, wherein the amount of water mixed with said compounds is in excess to that required for the hydrolysis, the said excess being such that the ultimate solution contains about 2-20 percent by weight of hydrolysate.
Claim 12
Independent Claim
18 words
The method of claims 1 or 2, wherein said compounds are selected from the group consisting of ##STR9##
References Cited (Backward Citations)
US4716051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |