Claims
- 1. A method of rendering an, inorganic-oxidic material water repellent which comprises impregnating said material with a stable aqueous solution of hydrolyzed alkyltrialkoxysilane, said hydrolyzed alkyltrialkoxy silane constituting from 0.5 to 45 wt. percent of the stable solution and having a pH of from 2.0 to 3.5, said silane being of the formula CH.sub.3 --(CH.sub.2).sub.p --Si(OH).sub.n (OR').sub.3-n wherein p is 0 to 3 inclusive, R' is an alkyl radical having from 1 to 4 carbon atoms and n can assume values between 1 and 3, said solution being produced by hydrolysis of 0.5 through 60% aqueous solutions of the alkyltrialkoxysilane at temperatures up to 40.degree. C.
- 2. The method of claim 1, wherein said 0.5 through 60% aqueous solution is prepared in a pH range between 2.0 and 3.5.
- 3. The method of claim 2, wherein said inorganic-oxidic material is a construction material.
- 4. The method of claim 1, wherein said inorganic-oxidic material is a construction material.
- 5. The method of claim 1 wherein the hydrolyzed alkyltrialkoxysilane has the formula CH.sub.3 --CH.sub.2 --CH.sub.2 --Si(OH).sub.n (OR').sub.3-n' wherein R' stands for an alkyl radical having from 1 to 4 carbon atoms and n can assume values between 1 and 3.
- 6. A method comprising: impregnating an inorganic-oxidic construction material with a stable aqueous solution of hydrolyzed alkyltrialkoxysilane to render the material water repellent, said silane being of the formula CH.sub.3 (CH.sub.2).sub.p --Si(OH).sub.n (OR').sub.3-n wherein p is 0 to 3 inclusive, R' is an alkyl radical having from 1 to 4 carbon atoms and n can assume values between 1 and 3, said solution being produced by hydrolysis of 0.5 through 60% aqueous solutions of the alkyltrialkoxysilane at temperatures up to b 40.degree. C. said solution having a pH of from 1 to 5.
Priority Claims (1)
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Date |
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3037220 |
Oct 1980 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 645,252, filed Dec. 3, 1984, now abandoned, which is a division of application Ser. No. 375,941, filed May 7, 1982, now U.S. Pat. No. 4,517,375, which is a division of Ser. No. 304,480, filed Sept. 22, 1981, now U.S. Pat. No. 4,352,894.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
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0006616 |
Jan 1975 |
JPX |
Divisions (2)
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Number |
Date |
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Parent |
375941 |
May 1982 |
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Parent |
304480 |
Sep 1981 |
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Continuations (1)
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645252 |
Dec 1984 |
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